This problem is worse than that though. Children abused by parents/caretakers are victims of circumstance. Problems with foster care aside, moving the child out of that environment should stop the abuse.
The problem here is that of commerce. There is an endless stream of Uncle Lesters in the queue. The child is a victim for as long as they have value on the market, and then they're found dead in a ditch somewhere.
> When I read that we should fight child porn, it means that we should give up our freedom and our democracy. Choose your fight.
You're going to have a hard time finding popular support for the notion that freedom protects your right to sexually exploit underage girls.