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...
The first one is what we should want to happen — a misplaced knee was moved by a colleague. There’s no context to decide if police inappropriately started an altercation. There’s no extended period of a knee on someone’s neck.
The second is police responding to someone on the ground fighting them and physically resisting arrest.
The third is pepper spraying a crowd that was refusing to move and let the police form a line, after someone lunged at the police.
The fourth is completely context free, and while unfortunate that a child was there, it doesn’t give us context to judge.
Your source also is using selective clips, that remove context to focus on emotionally triggering scenes.
Blindly chanting "there's no context" to every single video is problematic at best; it's a dog-whistle for cop apologists at worst.
We have videos of cops shooting projectiles at people on their own private property; cops approaching people who are walking away and just shoving them or beating them up for no reason; cops driving vehicles (or horses) into crowds or towards pedestrians; et cetera. One needs to be adamantly ignorant in order to believe that every single instance has been instigated by protestors.
Saying "protestors started every instance of violence" and now going "wait, we need the context to judge these videos" makes me believe you have zero intent of approaching this from a viewpoint other than one that vilifies protestors and glorifies cops.