Chairman Miaow said:
Does it help me? If no, does it harm me? If no, none of my business.
Simple logic.
Human's are biologically programmed to help each other.
They're biologically programmed to fuck and shit wherever they want, too. Doesn't mean they do. Society does a lot of reprogramming.
And I'm asking why law exists because if people shouldn't care about what happens to others, why would they make laws to protect people.
Emotions, to put it simply. Using logic there's no reason to help that random joe getting mugged. Emotions, specifically the one of empathy, are why people do, and are why laws are passed to make that mugging illegal.