Which is always going to be s balance about how you achieve protection and maximum freedom. So LR's question about protecting children, ism't feasibly answered by 'parental responsibility'
It really is. As a parent, you can easily install a range of site-blocking software, just like you can set the parental locks on channels on the television. That's restricting access to the potentially vulnerable children and not impinging on anyone else's freedoms.
If there are disreputable or irresponsible parents who won't supervise their children do you think they'll lock away their credit cards to prevent their kids signing on anyway?
Most of the social media networks have a minimum age confirmation to create an account, and innumerable parents bypass it, but I don't see anyone suggesting we ban social media, despite the obvious damage that it can do to vulnerable people. The computer games industry posts recommended age limits for its games, which are virtually ignored, and we only have a fringe suggesting we ban certain computer games, despite a wealth of evidence showing there is limited if any effect.
O.