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.