A Terry Pratchett quote came to mind:

“There are hardly any excesses of the most crazed psychopath that cannot easily be duplicated by a normal kindly family man who just comes in to work every day and has a job to do.”

I think any real psychopaths in the mob would not have a very high "notch count;" contract murder is something of a team sport, and that sort of person would be seen as too weird and off-balance to trust with that sort of thing.

You know, your Tony Mirra type...