Honestly, I watched about a minute of it before I turned it off. I like politics like most people like getting a root canal. I was interested in seeing what people here thought, though.
I did something kind of interesting. I watched it with the sound off. Instead of looking for whether his rhetoric was offensive or not, I looked to see if he did anything that would provoke the security guards into their actions.
What I saw: At some point, he was clearly asked to leave. It appeared from body language that it was relatively civil. A crowd gathered, and things started to go downhill. Perhaps it was the crowd that was becoming more of an issue? The cuts and lookaways were annoying in this respect, as it directed things away from the actions of the security guards and the protester. The one thing I saw that could have been an issue on the part of the protester was when he was being escorted off, and he wrapped his legs around the guard to his right. This could have been seen as an attempt to trip the man (apparently not too successful, as the guard in question was showing as much difficulty in walking as Mr. Oniya when the little Oni wraps herself around his
leg.) It was after that when the throwdown occurred. I've seen cops take a man down for resisting arrest - could this have been a similar (though overdone) reaction?
Just tossing this out there. As far as whether it's legal for someone to get thrown out of a state fair or any other event that they've bought a ticket for: short answer is that yes, they can. I've seen them escort drunks off the state fairgrounds before, as well as other people who cause a disturbance. If you're polite about it, they might even refund your ticket price.