Sounds like you're already against the cops. Cops shoot a lot of innocent people, but this sounds like the real thing.
I'm not necessarily against the cops, since information seems to be lacking. I do think they had better have real justification when they unload 50 or so rounds at what were apparently unarmed folk.
Although I understand the need for it, I tend to be sympathetic towards our founding fathers' distrust of a standing army, which some police forces are starting to resemble.