I think a very few are good considering anything and some are bad considering anything, but they exist. But for the most part, people are born social. Not all are but a majority. Humans are social animals. If you are nurtured you have a bigger chance of being a nurturer. If social rules state that you should be crappy with women, you will probably be that way. And so on. Being social is sort of meant for cooperation, but cooperation unfortunately works both through love and by force.

So can most people be good? I think so, if socialized right.