Theists: how do you account for psychopaths?

[brewer]

They have the ability to choose to behave morally even if they don't care or have empathy towards others.

I still fail to see how this has anything to do with morality coming from God.

I don't think you understand that a psycho/sociopath morals (if you can call it that) are all self centric. In other words, what is best for them is what is best period. So they do make their moral choices, their best moral choices, it just that non of their choices include you (or anyone else) in the thought process.