Well if we are just going to go back to the late 80's and early 90's when the mafia reached its apex, and before Giuliani's purge, then straight off the top of my head I can think of instances where citizens were hurt/killed in crimes committed by the Gambino, Colombo, Genovese and Lucchese administrations.

Sometimes several instances.

And that's just in a ten year period.

But of course, if you put a mobster on the cover of Time magazine and give his entire family a platform to lionize him then it's natural that some people are going to think the mafia are somehow better than the average criminal - which, of course, is complete nonsense.