Boasting in great detail about how they caught a bottom-tier expendable from some gang of criminals...that's usually not a sign that the police actually care about stopping the gang's "crimes".
The method worked.
Of course, it worked well most likely because the angle was extreme enough to narrow it down to a small set of seats. But it is also true that cammers would not dare to record it from a well vantaged location for the fear of being called out.
Also, if the public knows that one is not safe even if there are no CCTVs, then piracy may be reduced.