Why does everything manga have to have multiple chapters just to illustrate that the "Bad guy" is an irredeemable piece of shit?
We already know! He poisoned a child for having dirty hands while being poor! First thing he did when we met him! We know he's trash!
Is the bar for acceptable behavior simply on the ground in Asia?
Like, poisoning children isn't that big of a deal, so we have to show that he is bad to everyone? Because... what; is there a normal line of thought that killing children is fine, as long as they were irritating? Or poor?
If the bad guy doesn't harm every possible human, then they get the Friendship Ending?
Societies that allow people like this to do their thing are Societies that inevitably collapse.
Hell, look at my country... People like this hero are now in charge, and it's falling to pieces in less than 3 months.