NYC: $212M on Surveillance Cameras

Bruce Schneier:

New York City is spending $212 million on surveillance technology: 1,000 video cameras and 3,000 motion sensors for the city’s subways, bridges, and tunnels.
Why? Why, given that cameras didn’t stop the London train bombings? Why, when there is no evidence that cameras are effectice at reducing either terrorism and crime, and every reason to believe that they are ineffective?