Though it's true that some cops abuse the use of Tasers, in most cases it's the alternative to using a firearm, the asp (extendable baton) or even fists which can obviously all be deadly.
I recently completed a 9 month correctional officer course. In one class, we had to play "bad guy" and resist arrest while 3 classmates try to put cuffs on you. I'm 5'7" and it took about 10 minutes of struggling for the other guys (all 5'10"-6'1") to put them on me. I was drenched in sweat and black and blue the next day, but it proves what kind of struggle someone can put up. And i wasn't as determined as a real bad guy would be. We were told that two previous years ago, a student was pierced through a cheek with an open cuff.
As for the naked wizard video. He asked for it:
1. Cops enforce laws, they don't make them. He wasn't allowed to be naked there. If they had let it go, someone might have complained that they saw a naked guy there and the cops were ignoring him. Then they get suspended.
2. They asked him politely and repeatedly to put his clothes back on, that if he complied they wouldn't even arrest him.
3. They went to put the cuffs on him, he resisted. It actually is safer for the cops and the guy to get tasered then to get into a fight. Broken arm, ribs, stolen gun. It's also best to get it over quick when there's a hostile crowd surrounding you. They shouldn't even have let that woman approach him.
4. He was tasered several times because it had little effect on him either because they were "tuned down" or he had a natural immunity to it. I'd rather get tasered than pepper sprayed: we were sprayed at school and it was the worst goddamn thing I ever went through. Ain't like in the movies...worse.
