It doesnt matter what location your at. If you are making a public nuisance and are asked to leave and you dont you will be removed. If you put up a fight they have the right to subdue you and remove you.
You can see in the video they ask several times for him to step down. When he didnt they tried to lead him out. At one point the big black dude picked him up to carry him out. Then he put up more of a fight and ended up on the ground. Then he would not listen to the order from the police. Then he was tasered.

As for tasers being unhealthy I would pick it over a billy club to the head.

This was like a episode of Cops without the nudity.

I have a bother in-law that was a cop for 30 years and he loved tasers when they came out. It helped take down dumbasses with out having to beat them into submision.