Karma is a spiritual concept with no basis in science at all, and so called shitty people usually have their reasons. Aside from believing in law and order, I am pretty sure people are more complicated than that.

[ He's separating his dough into balls now. ]

If I was worried about something like that, I'd miss out on good allies just because they tried to kill me.

[ Senku says this like that's a totally normal reaction to people trying to assassinate you. ]