They were resisting arrest - ergo they weren't peaceful.

I suppose the police could have just beat them, it certainly would have been more effective - but when a person resists arrests, physical force is required, and the police chose a method that causes pain, but not generally the broken bones of a good whack with a nightstick.

Your tuition pays roughly 30% of your education, the other 70 is derived from taxing the oppresive capitalist system...

How ironic that a professor such as Angela Davis (a communist) finds her tenured position paid out primarily from the oppressive capitalist system!

Your accusations fall somewhat short in the face of fact, I fear.

cheers,
Nick