What's the difference between such surveillance and a security guard wondering around looking for suspicious activity and/or protecting shoppers/businesses?
Surely, it can be abused, but it can also help protect "suspicious" individuals from being profiled/targeted maliciously by such security guard, for example.
What if you were hit an intersection and said cameras helped to identify the individual who hit you and then ran, would that change your mind?
I don't think surveillance is the problem as much as who does it and the laws they implement.