Unnecessary according to whom?
To what you mean.
To the law and to the code of conduct of the police force.
If you break the law, peaceful or not, you can expect the police to take measures to uphold the law.
Again, broad brush.
Nobody said they could not clear the protesters. The ONLY contention so far has been that they used EXCESSIVE FORCE. You do not beat a person bloody for jaywalking, or cross the road to cross-check a guy off his bicycle (remember that one?). You do not pepper spray passive protesters.
She should not have put herself in that position, it's 100% her fault.
No, it isn't. It is 100% the fault of the person who pulled the trigger. The law is VERY specific about that. There may be reasons for the trigger pulling, but the responsibility lies in the hands of the one who does it.
She posed no threat. Are you saying that an 8mo preggo woman, unarmed, is a threat to a cop?
Only if that cop is her hubby.