First, most people are NOT "good most of the time". Welcome to Earth.

Second, psychopaths are not loners. Loners are self-sufficient people who enjoy their own company. Psychopaths need other people to hurt. The literal opposite of a loner is not a normal extrovert, but a psychopath. Loners are the most moral people on Earth.

It's amazing that you could do that much research and still be 100% wrong.