The problem with your theory is: the chances a cop catches a crime in progress is one in a million. Cops can't be everywhere at once and think about it. If you were going to rob a bank, are you going to do it with the police car sitting across the street? Criminals aren't the smartest people in the world but they're not retarded. What you guys don't realize is that most serious criminals are caught when they are stopped for a traffic offense such as speeding from the scene of a bank robbery.