One side has cameras. The other side has guns. When violence happens, who's fault do you think it is?
The state (or city, or nation, where appropriate)? Absolutely, but only when absolutely necessary. (like curfew orders which follow widespread disorder and destruction)
That's a hard argument to make.
When and where did this happen? The first step is verbally telling people to clear the area.
>If you tell a journalist they are under arrest, they will always comply. They won't fight back. So yes, still cops' fault.
Given the fact that the police are always outnumbered in these situations, and vehicles, jails and officers have limited capacity, arresting everyone who doesn't comply is impossible. So they are first asked to leave. If they don't they are pushed out of the area by force.
If reporters are too close to the police line that is pushing people they will get pushed along with everyone else. Breaking the line weakens it and hampers the police's efforts.