Welcome, Pation is approaching the question from the angle I would. Evil is a term wev'e coined for behavior that we all have at times been tempted to do but society in general discourages. Evolution has no objective, evolution is morally neutral. Behavior patterns and instinct are biologically rooted. Behavior patterns that were more successful in producing offspring than other patterns eventually became dominant. We can understand that happens with animals, don't we? In my part of the world deer have changed from daytime foragers to nocturnal in just about 50 years. The environmental pressure that made this change advantageous seems to be hunting season. It is legal to hunt only during the day and therefore those that were inclined to be night foragers were less likely to be shot. The whole species quickly became more nocturnal as this selection process continued over 30 or so generations. Now if we are honest we can see the same happens among humans. Certain types of behavior produce in better results for that individual. Noone likes to be around a selfish and aggressive person, much less a woman that wants a good father for her offspring. Sothese types of behavior patterns have been largely evolved out of our species which means that those who are truly selfish and aggressive are rarely seen in the population. However before you object there are more envionment pressures at work that simple reproduction succes. In times of exterme hardhip it is often the aggressive and selfish that survive. This means that there are times where in the generally undesired behavior patterns have the advantage. This is why thru the reletively short human history (c.500,000 years) we see both selfish and selfless aspects in a population of people and within individuals. There are many other aspects of evolution that I've not touched such as sexual selection that has shaped the female and male body forms and parenting skills. The fact that humans have been social creatures for a long time has also resulted in selection for qualities that work for the benefit of the whole and not just the individual, his is call group selection of kin selection. Going back to the deer, it is unlikely that deer will ever ecome completely nocturnal in any time soon. Why? because there is another environmental pressure that balances, favoring daytime foraging, CARS. Most deer accidents occur at night because of human's poor night vision. This means that evolution will (and is) produce a species that favors nightime foraging in areas and times with greater hunting pressure but will favor daytime foraging during the times and places where hunting is less a pressure than road hits. In this way deer behavior is shaped like it is in every other animal including us. They are striking a balance that works.
This is not suggesting that we have to accept antisocial behavior just because it is at least in part genetic. Humans have the right as a society to use pressure to shape the gene pool or at least reduce the exposure of the group to individuals whose behavior is harmful to the group. This is the whole history of life as social creatures. The dog that refuses to hunt with the pack is expelled. Since we are talking about behaviors that have a broad nearly universal consensus of disapproval noone should be conclude that this is ideologically motivated eugenics. It is in reality no different from a parent dispproving of a child's playmate when aggressive behavior is observed. When the whole world as a society is regarded as the protector of the young and the vulnerable, we can see the necessity of isolating aggressive or harmful individuals from the group.
I know I've been rambling, but this is a very real issue we all face as members of society. Dismissing our responsibilty to assist in this collective effort to make safe our planet is the worst antisocial behavior. This often results from believing primative myths about talking snakes and awaiting the spirit world to fix all our social ills.
