I am surprised at some of the reactions I see from you. This is America, people. The place where Sept 11 occurred. And without getting into the causes for that, the fact is that our country is extremely security conscious. You see it everywhere, the airports, sports stadiums, schools...and yes, especially at political functions. All of us have been asked to "keep an eye out". It might be considered to be a paranoid mentality, but that is the way it is and I don't see that changing anytime soon.
With that as the background, it is no surprise at all to me that this guy was handled in the manner he was. HisHoliness is right. There is a right way and a wrong way for civilized people to approach the question-answer portion of a political event. Generally, there are even "rules" that are sometimes stated to the audience before the speaker even starts. No political candidate should have to fear for his safety. Our government holds the safety of their political figures in high regard. The guy said nothing wrong, at least in the context of his actual words. But his actions, his demeanor, his disregard for authority (when asked to get on with the question), the way he raised his voice when he knew he wasn't being taken seriously...ALL of that combined to send up the red flag in the minds of security. It wasn't one thing he did that got him removed. It was the combination of signs of a potential threat to a political figure; it was the training of security to recognize when an escalation of events may be imminent. This is why we want security: to stop a tragedy before it happens. Was anything going to occur? Who knows? That point is moot. There is no way to only catch the bad guys and to only give a free pass to the good guys. They played it safe. Their actions are justified.