You never know what inspires psychopaths to kill.
Actually, science has a good idea of what inspires psychopaths to kill. We can't say exactly what the perfect set of influences that leads someone to kill, as human behavior is very complex. The perfect set of influences may be present in one person, which drives them to kill, while the same set of influences may be present in another person, who never kills anyone. Nonetheless, we have a pretty good understanding of what factors are related to extreme forms of violence.
As stated above, the issue is being able to determine at what moment, under what specific circumstances, and what set of influences, drives someone to kill. That we have not yet figured out.
Please do more reading on this topic, Prime Schmoe.
