There are plenty of reasons people in handcuffs need to be shocked. Just because they can't use their hands doesn't mean they can't run. Some of those people just go crazy and kick stuff and everything else. One time a guy in handciffs was pulling 5 cops that were holding on to him. If the cops don't have enough physical power themselves to detain a criminal they need to use things like tasers, it's better than when they are beating people to death with their clubs. The amount of tasers they used was definitely excessive, but at the time when this guy was trying to get out all the cops in there drew their tasers, they didn't have time to put on a poll of which cop should use his taser, it was instinct.