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That brings up the question, "How do people get good hearts?"

How much of it is genetic and how much of it is nurture? I think good people can do bad things and bad people can do good things. The concept of a good or bad heart may just be another label we use. Yes, physically, some people have unusual, psychotic brain structures which lack empathy and compassion. Most people are not like that. For those that are, we'll have to come up with ways of dealing with them. One crazy idea I had once was to put them in super-realistic VR simulations so they could live according to their own desires without harming any other "real" person. I think that's a better solution that locking them in a cage forever or executing them. It's an idea, anyway.

If thats possible, that might work but aside from that, we really could do nothing. Ideas may work and it may not. The best thing I guess we could do is to make our good hearts contagious so that others will be infected :).

It is neither "genetic" nor "nurture" but judgment and choice consistent with TRUE morality (underlying nature of reality/Universe).
Which nature we must discover through observation, contemplation and, essentially, trial and error (and sometimes (often?), pain.