Looters: Missile weapons, numbers, aggression, lack of restraint, speed, agility.
Police: Body armor and shields.
This video is mind-blowing in it's total repudiation of what Australia's Herald Sun calls "a managerial, bureaucratic process-driven style of policing hatched in the rarefied confines of academia rather than on the harsh reality of the streets."
The looters are all offense and the police are all defense. Because the police have no missile weapons and are too weighed down with armor to pursue their enemy, the looters can engage and disengage at will with absolutely no risk to themselves. The psychology of the mob changes the instant they realize this - at about 0:30. The problem isn't that one mob figured this out, it's that they all did or all will in the very near future.
This is what happens when you won't aggressively defend your culture.