The LAPD could not determine IF there was any ammo on board, and the guy had tried to kill several people aready and would have gone into oncoming traffic had he not gotten stuck on the divider. Oh and he was in the process of getting himself off when the shot him.
I loved the scene after he rammed the pedestian overpass with the K-9 unit dog snapping at the tank and all the deputies walking up with their 9mms drawn, like they were going to shot the tires out? put a hole in the fuel tank? OR just show the guy that they meant business.
Too bad they could not have gotten the Marines to dispatch a TOW Cobra or a TOW LAV for some live fire pratice. Air space was probably too crowded with the news helicopters circling around.