My concern is that this will turn into citizens adopting a semi-crazed state of vigilantism. In the States where I'm from people around here take the Neighborhood Watch program WAY too seriously -- 24/7 neighborhood patrols in their cars, radio communications, etc. Now that people can upload possible evidence, I can see people taking a fairly innocent concept to a whole new level -- actively looking for "crimes" and recording the footage.
And, what about privacy issues? It would only be a matter of time before people start suspecting their neighbots of "crimes" and put 24/7 surveillance on them.