Smarter kids to prevent grooming and sending pics (btw, in most states this turns kids into child porn producers a more serious crime than child porn viewer).
To stop the adults abusing kids it’s hard like any other crime.
Sadly when end to end encryption gets blocked the highest number of convictions will probably be 12 year olds, since they are probably less likely to be able to get around controls.
This is even worse than the OP