Lies every parents tell themselves. Either they will watch porn at age 11 at school or at a friend, or you isolate them from society and they resent you forever.
You can't control every aspect of your child's real life or online activities, that's naive and I don't believe you actually have children, let alone teenagers.
> Government controlled access to internet is a disgrace in any form.
And in fact it's not a "disgrace", it's outright dangerous, a ready half-step to totalitarian control. Regardless whether one trusts their current government or not, it is a threat to democracy and freedom that can be activated by any later regime.
What you don't want is to say "I can't control every part of my kid's life, so I need to government to come in and control the remainder."