The most common age for someone to be labeled as a "sex offender" is as a teenager. So the system of "registered sex offenders" causes tremendous suffering, and most of them don't need to be "protected" from.

Having sex is normal behavior for teenagers. In the US, they may be labeled as "sex offenders" for life because of this. Then they are not allowed to go near children — so they can't live with their families any more.