I don't ascribe what happened to Qadaffi as mob violence, but the execution of a despot who was dispatched summarily with a shot to the temple. They were meteing out justice. Hell, we had been bombing Qadaffi for months trying to kill him and his forces. This was not a criminal matter. We have been killing American citizens using drones.
Here is a excellent report on what happened today.
Headshot: The body of former Libyan Leader Muammar Gaddafi lies in an ambulance as it is brought to hospital in Misrata, a bullet hole visible in his temple
Hardly recognize him without all of his makeup.