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.
There are way too many cases where a cop provokes a confrontation, often by stopping to allow someone else nearby to run into them, and every other cop in the group responds by beating anyone nearby and shoving back anyone with a camera.
You don’t get coordinated responses like that without planning and practice.