I’m going to be honest, I’m suspicious of every single ‘pedophile hunter’. They are going after a demographic that people will not rush to defend, even if innocent.
Also, these ‘hunters’ probably have something shady going on in their own lives, and this is some form of projection that they also profit off of.
You conveniently left out the mostly likely case of them being Neo-Nazis which have been around since post-WWII.