@AbyssalMonkey I've just started reading this, but I feel as though that's not the takeaway that we're supposed to be getting from this. At least I really hope it isn't.
From my perspective, this is how I understand the morals of the story.
In the first run we so far haven't actually seen anything that the past party did poorly, personality or otherwise.
What we do see is a hero who wants to play this world like a video game, and just wipe anything out that gets in his way.
For the elf, she might have been raised as a human hater, but the idea was probably to change her mind. Be a strong moral compass and personality yourself, and get her to see the error of her ways. Fairly common story in regards to fantasy like that.
The sword king guy doesn't seem bad in flashbacks. Just giving the hero hard training (which worked, by the way), is not a case of his being bad.
His anger against the hero this time can be assumed to not be related to his previous personality. Given that the hero went and attacked him and then further proceeded to agress him every second he got. Sword king only sees some pompous summoned hero who's a complete asshole to everyone, who wouldn't wanna get a chance to 'beat him up' in training?
I really hope the hero ends up failing for his current path, or they really show that all of the past allies were actually terrible people somehow in the first run.
I bet the hero really is just a jackass who doesn't have any social skills to speak of, and blames everyone else for it. He's obviously not morally aligned well since this is supposed to be an actual world, and he's more of the opinion that he should just kill anyone that seems good for xp.