When you get a gun pointed at your face, or your home violated, or your car stolen, you tend to rebalance your principles a little. The cameras are a symptom of bigger problems.
It's so hard to draw a line of what is good or bad, and it seems like the majority are okay with this technology. Which I think means the conversation should shift from should we allow these cameras at all, to instead, how can we allow them to be implemented in a way that minimizes privacy risk as much as possible while still remaining a valuable tool to solve crimes.