Hmm, interesting topic this turned out to be.
So the guy was being a smart-ass who wanted to make trouble. This still doesn't counter-act the fact that the police officers did a whole lot of mistakes on this one.
mistakes:
#1 When the guy was leaving quietly (he was by the door, btw), why would the police officer suddenly touch him? Now that's just like asking for it. As far as I know, he wasn't under arrest at the time he volunteered to leave, so that's excessive force when it DEFINITELY wasn't needed. Even a small a thing as that is excessive force ... if it's not needed, why use it? Especially on hard-assed people like this guy, they should have let him walk out on his own terms, otherwise I think they could have been sure that he'd make a scene ... so in fact the cops were the ones who lighted the match, had they been trained properly, this wouldn't have happened in the first place.
#2: The guy was resisting to the excessive force (and the slight touch was still excessive force) by thowing himself on the ground and protesting. But as far as it is apparent, he wasn't resisting arrest, he was just being a hard-headed nut. And I can't hear any of the officers telling him to stop resisting arrest ... they're just telling him to get up. As far as I know, in the states, when you're under arrest, you're supposed to be told you're under arrest, they tell you your rights and they lead you to the police station IN HANDCUFFS. None of these seem to have been done as shown in the video ... the handcuffs are applied later, after he refused to get up and was already stunned twice. As for being declared under arrest and being told his rights, none of the officers did it. So really, he wasn't under arrest. That was their mistake. As far as the guy knew, he wasn't under arrest, nor did anybody else think he was. The cops were being the hard-headed ones in this one.
#3 Suppose they had officially tried to arrest him and he was resisting, why would they need to use the tazzer 5 ... that's F-I-V-E times? You taze him once, get him into the handcuffs and drag his butt out of the place ... but no. The officers thought it much easier to taze him a few times and convince him to walk out. Did they really think that if they tazed such a hard-head enough, then he'd co-operate? That's not trying to arrest the suspect, that's trying to beat the suspect into submission. They wanted to have him walking out on his own two feet and wouldn't have it otherwise, that's bullying .. a proper cop wouldn't attempt to get the suspect's approval on the arrest, if he's under arrest, he's going to the station, whether he approves or not doesn't matter. It's not as if he was holding onto something so they can't carry him out or anything, so the subsequent electric shocks were absolutely unjustified
#4 Say this was an arrest and the public around the area protested ... they should have ONLY been told to stay back. But the cop not only told them to stay back, he threatened violence on people that weren't even implicated in the guy's plans. Since when do the police have the right to threaten innocent civilians? As far as I know, it's within any american's rights to speak out and protest against anything, so they're not only doing a bad job, they're going against people's rights. And why do they threaten innocent civilians when their duty is actually to protect them against threats and violence?
As far as I can see, that's not police work, that's just using police work as an excuse to push people around.