Theists: how do you account for psychopaths?

[Amarok]

Ok, so if a person doesn't have intrinsic value, then they only have value to those who value them. So if I dont value someone, that person has no value as far as I'm concerned. I do, however, value myself and my own well being. If doing something that will benefit me and be detrimental to someone else whom I don't care about, why shouldn't I go forward with it?

Because that would be self undermining

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It matters to them, but it may not matter to me lol.

Then in the long run you only end up hurting yourself .

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What if my justification is this: value is a matter of assignment. A thing has value only so far as it has been assigned value by the people who value it. So if I don't care about or don't like a particular individual, that person has no value to me. In other words, a thing has no value apart from the value the individual person gives it. 

Again, I'm playing devil's advocate. What I've said above is actually something I've seen written here many times by atheists who believe morality and human value are subjective. 

Are you saying human beings have intrinsic value? If so, says who?

Answered above

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Says who though? Isnt value subjective to the person who is doing the valueing? That's an argument I've seen said here many times. Obviously (and unfortunately) everyone doesnt matter to everyone. 

Then those people are engaged in self harming behaviour

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This line of reasoning is pure moral naivety