Knowing what we know and the current standard for crimes committed by police, why would a person even bother taking them to court? Justice simply wont be served.
But enough people take care of things themselves, then the courts will have no choice but to start prosecuting the asshole cops who do step over the line in order to reel in the vigilantes and to show people the system does and can work and to balance things back out. Right now cops get away with murder and no one is doing a damn thing about it but holding signs and/or burning down their neighbors business. I dont believe middle ground will be found on this issue without first swinging violently back the other way.
If I was a cop that was capable of murdering someone and then everyone starting burning other peoples houses down in retaliation, I'd probably laugh and even possibly do it again someday. But if my house was a blaze, I'd be telling my coworkers to be scared and to not fuck with these people...