@nbhstcqbvvpmacjrmv
The examples of unexpected writing you gave are sci-fi/fantasy examples. The only other example you gave was that of a person becoming genocidal for having their food thrown away, but you're using that as an example to say how absurd the brother's behaviour is. Indeed, I elected to ignore it because it is a meaningless example in the context of what I was explaining to you.
Your point required you to introduce fantasy/sci-fi elements into a series that is neither fantasy nor sci-fi at the 45th chapter. This is the exact reason why I asked if sci-fi and fantasy the only genres you think can go beyond expectation. Or rather, do you think sci-fi and fantasy are the only genres you think should be allowed to go beyond expectation?
Indeed, I won't pretend to be able to grasp the absurdity of your reasoning. A sudden change in the brother's behaviour is caused by the psychological trauma of losing both his parents at the same time. Heck, even losing one parent is enough to completely change a person's character. What kind of "foreshadowing" are you looking for when the cause is already clear-cut? Just because the transition makes no sense to you doesn't mean it is inexplicable. I just explained to you what psychological trauma does to a person.
I'm not sure if you think only one form of irrational behaviour is allowed, because that's plain irrational. I don't understand what you're trying to say when you said, "According to you, that's okay worrying because irrational behavior." What's "okay worrying"? And even if it was the case that he becomes happy at hearing news of his parents' death, why would that be lazy or bad writing? Because you're too ignorant to consider that things in the world happen beyond what you know and understand?
No one is ignoring the realm of reasonable expectations. The problem is, your expectations are fundamentally limited and therefore unreasonable. The problem with you is that you think anything that happens outside of your set of reasonable expectations is therefore unreasonable, without realising that your expectations are like that of a frog that lived its entire life beneath a well. We know in real life that psychological trauma can induce drastic changes in behaviour up to and including behaviours that are considered irrational, therefore the brother's actions and behaviours are very much realistic since it reflects things that do happen in real life. Now, acknowledging that such a thing exists is not the same as saying that such a thing is acceptable, but this, of course, puts a nail in the coffin of your ignorant judgement of "bad writing" based on personal incredulity.
The problem is you're not following my words. You're not following any semblance of logic at all.