Do Social Problems Require Social Solutions?

The same thing that makes us friendly is the same things that make us horrible. So might these negative traits among us disappear eventually due to the theory that friendliness is better for survival of the species? I always get asked, you know, well, can't we if we can breed animals to be friendly, why not humans? That's a quick road to eugenics, which is a repugnant morally in every way, shape or form.