This kind of surveillance does not work for prevention. Some of the Paris terrorist were on file, some have been arrested previously, yet they were all able to

This kind of surveillance does not work for prevention. Some of the Paris terrorist were on file, some have been arrested previously, yet they were all able to get guns, explosives, and enough time unchecked to commit the multiple attacks. All this in a city where the military was already patrolling the streets in the Vigipirate program. There's no way this is going to fade into the background and stop becoming a nuisance, because making a spectacle out of it is its only benefit. Since it does not work to prevent, it must work to show people that something is being done.