Then you failed. Consider the following variant of your argument:

"there are plenty of non child molesters who think it's immoral for any adult to have a sexual relationship with a child, whereas I'd guess there aren't many child molesters who think it's immoral for other adults to have relationships exclusively with adults."

"I think I wanted to show that people who are not child molesters usually are because of a cached belief, whereas people who are child molesters usually are because they've thought about both possibilities and concluded one is better."