Can you make a killer

Answer 1

People can be desensitized to the idea of killing so that they will kill when ordered. That is the purpose of the indoctrination techniques that are used during military training. It may also be a partial result of violence on television and in Video Games. Normal people, however, cannot kill without great danger of suffering severe aftereffects (post traumatic stress).

People who can kill without compunction or emotion are called psychopaths or dissocial personalities. Unfortunately, roughly 3% of men and 1% of women fall into this category. Out of a population of 300 million in the US alone, that gives us plenty to go around, although by no means all such so-called "sociopaths" express in that way, and some channel their relative lack of empathy into useful channels.