If they do what they're supposed to, I have no problem. However, when they pull stunts like Blackwater(now know as Xe)did in '07, they have every right to be prosecuted. Between 2005 and 2007 Blackwater was involved in 195 shooting incidents, and started 163 of them. Without being there though, it's hard to say whether they were justified or not.
In addition, many of those shooting are reported to have started when a vehicle failed to stop when ordered to by Blackwater guards, likely leading to the assumption of VBIEDs(Vehicle Borne Improvised Explosive Device).
So, when did the prosecution happen? Was it immediately after the attack, or a while after that? Are they even connected?
As for the "small jobs" part, the PMC's mostly dealt with security, such as protecting the U.S. Embassy in Iraq.
All in all, as long as they PMC does what it's supposed to, without breaking their contract, let them do it.
"We are men of action, lies do not become us." - Westley
"You keep using that word. I do not think it means what you think it means." - Inigo Montoya
I wanna spin around on a 45.