1)identify one. Gain their trust by pretending to see them as human and pretend to support their views to rape children.
2) Get evidence they are a child rapist. Aka child porn, trying to approach a child, online posts, record your conversations, screenshots, etc.
3)Get them over in a place you are familiar with and can handle your business.
4) Pick your weapons of choice. Unless you have proof they have raped don't kill them or go to far. The law gives these subhumans rights. Don't use sharp objects like knives, use blunt objects or if no weapons are involved bring other Justice Warriors for Children JWC to beat them up.
5) Blackmail them that if they tell you will send all the child rapist proof to family, friends, employment, and make web pages with everything. They need to be grateful they aren't dead.