I'll agree to disagree with you on the "does nothing" angle. Pedos do what they do believing no one is going to catch them. The fact that they're being caught means the next time they want to do it they're going to think twice. Ultimately, it may mean they can re-examine their lives and move on whereas convicted pedos have a high rate of recidivism likely because their lives are ruined.

Anything in addition to the potential for a law enforcement sting that demonstrates to potential pedos that people are watching is good.