Everything seemed to be going just fine, he was acting a bit crazy and what-not, but he was letting them escort him out. Then out of no where he breaks their grip and makes a run for a high profile political figure. At that point I think the cops were justified to beat/taser the fuck out of him. You dont fuck around when a high profile target is in the area.
If the cops had been pussies and let him prance around, and out of his waistband he pulls a gun…Well then everyone would fault the police for not doing their job.
So yea, was it a bit excessive? maybe, but Kerry isnt some schmuck of the street. He deserves the protection his status deems necessary