How do you know that?
>Were property crimes up significantly prior to the installation of the ANPR readers? No. Are they down significantly after? No.
I get that this comparison sounds similar, but it really doesn't make any sense. The most powerful nations in the world are constantly trying to gain as much access to our secure systems, communications, and infrastructure. Even though these efforts are almost entirely hidden from every level of the public, we still have plenty of stories of things like Stuxnet or the Chinese obtaining classified engineering data.
The NSA exists to combat this. They aren't fighting crime. They aren't fighting what is essentially an economically guaranteed statistical effect (property crime). They are an intelligence gathering and signal analysis agency tasked with thwarting foreign actors, which we know are actively pouring massive resources into activities hostile to us. That is why they exist, and that is why their successes (and failures) are almost entirely unknown to the general public.