You would thimk after 10 times the police may have figured it was not working.
There appears to be no reason for this at all. The young man was probably on acid, but not violent, and from all accounts he was acting strangely (including taking off all his clothes) but never once became aggressive. He was less than 6 feet tall and weighed barely 150 lbs. There is no reports of him throwing cops around at all. In fact, it appears that the cops never even tried to physically restrain him other than using the tasers and then beating on him with batons. This is looking very bad for the officers (some say that there were up to 12 officers).