One way that would put down lots of exploitation and support privacy of adults would be video and online surveillance of all children when not alone, using a parent-controlled computer to detect bad things happening. This could start in kindergarden and school and gradually expand to all spaces that are not home. Children have some right to privacy, but not as strong as adults.
On the 16-th year, if the child wants so, surveillance gets turned off and he/she is granted more privacy. Like with age limits on car driving or working, at some point the state says, you are old enough to take responsibility, we won't protect you from harsh life anymore.
This is a targeted, reasonable solution with little collateral damage, that upholds the right to privacy for adults. It's what parents would want, instead of the bureaucrats. And who really, actually cares about safety of the children, parents or bureaucrats?