Study reveals psychopaths have significant differences in brain structure -- grey matter.

[Prophet 451]

12. The psychopath wouldn't care

First off, the psychopath doesn't think they will be caught. That's true of most criminals (which is why no punishment will have a deterrent effect) but especially true of psychopaths because their emotional responses are muted. They don't feel fear (or, at least, not in the same way we do) so they don't fear punishment.

Secondly, the vast majority of psychopaths are not violent. For most psychopaths, they can legally fulfill their desires so they do so. They only come to the attention of law enforcement in they have a desire which can only be fulfilled illegally (usually, but not always, sexual sadism).

Thirdly, they would view their lack of emotion as a strength rather than a weakness. Talking to a psychopath is a very unnerving experience because they literally do not think in the same way you or I do.