Lately there have been groups formed to confront child ****** predators but they are you-tube mobs not working with the police.  Generally, they only care about the money they earn from youtube subscribers and not the kids.
As the suspects are often unlawfully detained or even assaulted, their evidence is not admissible in court for illegal enticement. They may get named and shamed but it drives them underground and they either stop or they learn from the mistake. If they only learn from it, they will be more careful next time and probably have a better chance of success of their predatorial behavior.
The humiliation can simply make them worse as monsters, drive any empathy down to lower levels and reduced compassion.