Honestly if you watch that and think the police did a bang up great job, which an awful lot of people seem to be saying in this thread, then perhaps you shouldn't be surprised about all the shootings. If you're okay with this level of violence, I don't know what to say. Someone else earlier posted asking why the police were in such a hurry. Exactly my thoughts. She was in the car, restrained. Give the girl some time to calm the fuck down, try and talk to her like a human being for a minute, perhaps show some empathy and calm her down. She was clearly panicking and obviously not acting rationally because of that. The pepper spray in the end was absolutely, completely, 100% unnecessary. Just because you have the tools, doesn't mean you should use them. Use your fucking brains, not your muscle. She simply wasn't a threat, just a pain in the ass, is that excuse to pepper spray a teenager?
Seriously, your police are fucked up. Whether or not she committed a crime is deflecting from the fact that this level of force, this method of handling situations is not good and fosters a deeply broken thought process within the police. When you're saying "well she was being a bit screamy" as justification for macing a child in a confined space you need to check yourself.