the fact that you try to shield pedos is disgusting. these people cannot be rehabilitated and every parent should know where pedos live around them. Actually US already provides this info with handy maps. Once I had a really creepy neighbor move in and I looked him up there but did not find anything to my surprise.
What makes pedos different from murderers and thieves and guys who beat up their wifes? They have been punished and then get on with their life. Chasing them for the rest of their life does not make them behave any better.
May I remind you that most child abuse happens by non-creepy looking uncles, teachers, pastors, babysitters, etc. They are around you, always. And what will you do if you know where they live? Go to their house with torches? Keep your kids inside forever? You have to learn to deal with it. Teach your children not to go with strange men. And talk to your children so you know something is going on in case a non-stranger is doing things they are not supposed to.