And we've probably seen way more incidents where a mini-mob of cops decided it was good to pummel on someone, just because their blue brothers are doing it. Point being, we can't just judge something by the ways in which people will end up abusing it. Almost all things can be overdone and abused by the determined/misguided/malicious. Sure, having a "mob" on speed-dial might be a bad idea, but at the same time we could be throwing out a perfectly valid crowd-source solution to crime. Which is not something I think we should be throwing out lightly in our society of "don't get involved" mentality.