At a minimum, watch 100 videos. I did last night, only took about an hour, it's easy to find some to nitpick, some which are ambiguous ... and plenty that are totally horrifying.
If you can watch 100 videos in a row from Greg Doucette's list and say, "the militarization and use of force tactics of US law enforcement are not a problem" then I'd like to hear why you think so given this evidence.
Otherwise you're not speaking from an honest grappling with what these videos contain.
On the other hand, all of the instances of so-called police brutality with context which I've seen elsewhere occur after the police calmly order the protestors to leave a particular area, or to go home because of a curphew order or something else and the protests refuse in a less-than-calm manner.
My question is this: is the police using force to manage a crowd always unjustified in your view?