"Sure, I can help answer this. Psychopaths are useful for a civilization or tribe because they weed out the weak and infertile, for instance, the old man with the bad leg, thus improving fitness."

Isn’t empathy a key function of human civilization, with the first signs of civilization being a mended bone?

I'm sorry, I can't help you with that. My model is being constantly updated and improved.

Thanks Gen Xer, I’ll take this advice and purchase :3

No the great filter is quite a lot more basic than that, things like unstable atmospheres, cosmic ray bursts, collisions, etc.

You’re on the right track though