He went WHERE A COP TOLD HIM TO GO! Additionally, he proceeded very very slowly if you watch the video. To be treated the way he was is asinine.
I think there was an overreaction, but take this analogy.
If I come on an accident that has closed 1 lane of the highway and a police officer directs me to go around it, I can go around it. If another officer steps out an tells me to stop, can I just ignore that 2nd officer because I was just going WHERE A COP TOLD ME TO GO? Of course not. Circumstances change.