That's funny, because the majority of the clips I've seen have unprovoked or inappropriate responses from the police. Seattle alone [0] has had numerous incidents. It's trivially easy to see this, to the point that one would have to ignore many incidents to say "every instance" was started by protestors.
I believe that you are not arguing in good faith.
[0]: https://github.com/2020PB/police-brutality/blob/master/repor...