What is a "conscience"? Do we mean culturally inculcated aversions? Do we mean moral rationalization? Do we mean cognitive habits? Our "conscience", as far as I can tell, is equal parts guilt and rationalization. It is our conscience that tells us it is ok to yell at the coffee server, because that coffee server is slow and incompetent, therefore I am justified in treating that person badly.

We don't need to worry about sociopaths. I'm probably a sociopath, and so do not engage in daily piss fests and turf battles like all you little people. Mostly I just look down on everyone as silly billys.

What you need to worry the most about is a man with a conscience and reason to kill. The sociopath isn't quite so committed.