Earlier quoted context omitted.
There's zero proof anywhere that these devices do anything about crimes. How could they? A camera can't lock someone up.
They provide law enforcement timely information about the location of wanted (e.g., stolen) vehicles. Law enforcement can act on that information. If law enforcement does not have that information, it cannot act on it.
You're also ignoring the risk here. These devices open up a whooooole new class of mistakes that can be made. There have already been people wrongfully jailed due to surveillance technology.