I really should of been able to work out that one... :-) Something I was giving some thought earlier was although your lack of conscience scares me, plenty of people such as serial killers torture and maim innocents and say their conscience TOLD them to do such things so maybe you not having one isn't so terrifying after all... :-) You seem logical, you say you are so they're shouldn't be any reason to treat you any differently than I would anyone else.
Martha Stout is a clueless idiot who only has prison population as a control group. Rest of her "expertise" is nothing but assumptions and personal opinions.
To voice my opinion to the original question i would have to say that i *think* psychopathy is something that develops at some point. The human brain doesn't stop growing until your mid 20s, if i remember right, so wouldn't it be plausible to think that at some point in the brains development some anomaly appears? It's just something i've thought of. We know so little about our brains that i can safely say that no one knows the cause.