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littleoni:
Let's go with that then.
1. I do not agree that we can consider the MC as "morally good" or not "evil". He is morally corrupt, and I will present my arguments as to why that is so. I will break down the manga by chapters so that I can build a full picture of the character of our MC:
Chpater 1-2:
He has killed people. You may argue that he was protecting the village from bandits. However, he could have let the rest of the bandits surrender after killing their leader, he murdered everybody nevertheless. You can also argue that he killed them because he thought it was all a game, however as already noted (refer to the relevant links in my previous reply) ignorance excuses neither lawfully nor morally. At this point one may still believe that he has some sort of conscience. But what do we see after that? His feelings of "guilt" are certainly short-lived, and they can be summarized by his thoughts: "I am not even proud of that moment when I sliced through that guy's stomach". That's it, this is as far as his feelings of "remorse" go. A few minutes later he's all pumped and ready to go, and the next day he takes his "reward" for murder without much hesitation and accepts to sell a person into slavery.
So what do we have so far:
Murder: check.
Lack of remorse: check (further reinforced by taking the property of his victims).
Failure to accept responsibility: check (rationalizes his actions).
Impulsive and reckless: check.
Deception: check (though I would argue that it was necessary in his case).
Failure to conform to social norms: check (at least in accordance to the social norms of his time, since these are the ones he's used to and knows best).
Just based off of these he has an antisocial personality disorder (he is basically a sociopath).
But let's go on:
Chapter 2, page 19: "Thinking of people as equal is kinda tiring".
Disregard for other people: check.
Chapter 2, page 23: "A brothel. It's a place where you can live out all of your romantic fantasies"
Cannot differentiate between lust and romance : check.
Chapter 2, page 27: "The bandits were only small fries that were easily defeated in one stroke"
Not only lack of remorse but also arrogance: check.
Chapter 2:
Sells a person in slavery.
Further reinforces disregard for others.
Chapter 3.1, page 3: "If I can sell a slave then buying a slave is pretty much a given".
Uses his unethical actions as a rationale for more of those. By this point it should be obvious that his moral compass is MIA.
Chapter 3.1, page 3-4: "If I buy a slave could I really do whatever I want with them!?"
At this point he is thinking about a human as an object or property. Emphasize further disregard towards others.
Cahpter 3.1, page 6: "But isn't buying slaves supposed to be a crime? No... that's just the logic of present day Japan"
Note that his desire to buy a slave is fueled only by lust at this point. So he is more than ready to sacrifice his previous morals and principles to fulfill his carnal desires. Society calls such people morally corrupt.
And once more he uses him performing unlawful (obviously not in the new world) and unethical acts to rationalize his desires:
"It's not like I haven't had anything to do with the buying and selling of slaves either"
Chapter 3.2, page 3: "I can buy Roxanne?"
Swap that for "I can buy a human?" - more of our MC's shenanigans.
Chapter 3.2, page 9: "Have you ever considered buying a slave? ...Not really."
I am not sure who he's trying to deceive at this point. Both the owner and he know that he has considered it, otherwise he wouldn't be there in the first place.
Chapter 3.2, page 14: "Is a virgin slave's value... different?"
Out of all the things the MC could be worried about, it's the money. At this point there's no doubt that he has no issue seeing another human as an object that he can buy to satisfy his lust.
Chapter 3.2, page 17-18: "But, is it ok for me to buy a slave? But if I don't buy her, she'll be bought by someone else."
Red herrings his out of that one. It's still not ok, he's just trying to rationalize it. And you can actually see the culmination of that thought process on the next page, he still cannot give an answer to his own question. What we see instead is this: "Even after saving a beautiful knight's village, I couldn't have my way with her." - This clears up what the MC's values are beyond doubt. His primary concern is whether he'll be able to satisfy his lust, and everything else is secondary (even murder).
Chapter 3.2, page 21: "I don't want to admit it, but there's a part of me that wants to buy."
The understatement of the year. It seems like all of his actions are motivated by one thing alone.
Chapter 3.2, page 22: "Morals and feelings aside, it's physically impossible."
As if morals and feelings were a factor anyways - two pages later he's certain he'll buy her.
Chapter 4.2, page 21: "Let's hunt some golden heads."
Seems like our MC is ok with murder at this point if he can profit from it.
Chapter 5.2: Murders a bunch of thieves in cold blood in their sleep.
Our MC is definitely a paragon of justice, morals and humanity. /s
Chapter 6.1, page 11: "I'm confirming. I've got the feeling I haven been ripped off, and I want to confirm just how far she intends to let me go."
Apart from the ridiculous dishonesty and rationalizing of his actions as "confirming", he specifically thinks "how far she intends to let me go" not whether she enjoys this. The MC is well aware of his position and actions.
Chapter 6.1, page 12: "It is unfortunate, but I have no intention of letting you go."
This basically read as: "I will have my way with you, whether you like it or not". You don't see much enthusiasm from her either, it's pretty obvious what the situation is.
Chapter 6.1, page 13: "Probably, it would be fine even if I pushed her down right here."
This speaks enough by itself. Do you really believe that a person with integrity has such thoughts?
Chapter 6.2, page 16: "I will have her let me see them."
Note that this is not something up for discussion in his mind, regardless of what she thinks and wants.
I think that's more than enough evidence to show the moral corruption of our MC. Not only is he morally corrupt, but he's considered a sociopath by today's standards based on his actions till now.
2: You agree with the part where a purchase of a slave can be ethical, but only if the slave is released immediately after.
Since I want to keep this short I'll ignore this since it obviously doesn't apply to the current scenario. Suffice to say I don't agree with you, I can go into details as to why if you insist.
As for why would the slave, we agree that any slave that can tolerate having sex with a stranger should sign up as sex slave. [...]
No, you agree with that statement and the ones following it, I do not. But as explained, I will not pursue this further since it just detracts from my main point. Once again if you insist that this is relevant in some way to my point, I can go in details. I will just summarize why I believe most of your arguments do not hold much weight: you're assuming too much, you're using outliers as examples rather than make an argument based on the average, or you simply do not present arguments in some cases.