Taking things "case by case" means there has to be a case to take. It does nothing to prevent it in the first place. The kid is already screwed up for life by the time a task force can locate them, If they ever do. I'm sure the overwhelming majority of the cases are not pursued.

Peruse the criminals, block the sites, Limit The Revenues, and you will effectively reduce the amount of children abducted and more importantly decrease the incentive to do so.

Case by case is not working and never has.