i don't have an exact answer to your Question...but i will take a stab at it being ex-lawenforcement.....its the children they (law) feel could be in more danger of a sexual predator,then most other crimes...while i understand a thief ,wife beater,dope head poses some threat to a community ...they are less likely (in general) to prey on your children.
trust me...sexual Predators are on the bottom level of the food chain even in Prison...bottom line they will get Killed in jail if not an a$$ whipping everyday....so there is some type of honor even in Prison among thieves when it comes to children.
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Bjuice..
"I'M YOUR HUCKLEBERRY ! "