I'm sorry if I wasn't clear when making this point so I'll clarify. While progressives see sit-ins, demonstrations as peaceful, that is not/never how the state preceives them. This is why the police are called.

They are not peaceful to the state because the state considers it "disturbing the peace" because it disrupts capitalism's business-as-usual concept (how can their be peace without justice?)

And when the police are called, they bring the force of the state's capasity for violence with them -- not just guns, batons and tasers, but the ability to threaten, intimidate, beat and arrest. They (the police; the state) brings down the violence.

(how many times have i been to a peaceful demo where people are literally chanting "this is a peaceful protests" while the cops are rushing in and beating the shit out of the people at the same time)

Essentially, what we consider as peaceful is considered a threat to the state. Sad but very true. This is why police behaviour (the state's behaviour) needs to be challenged in this regard.