IRL it was easy to cordon off sections of stores where the 'adult' material was on display and whatnot, but a similar approach to the internet is a tad more difficult. ISPs can block access to adult sites if you request it, but it's usually drawn from a list and doesn't encompass the entire internet, and it differs by ISP. And even on websites that should be safe (youtube, twitch, roblox, tiktok), people still try to skirt the edge of what's acceptable to show kids. If it's present on every square inch of the internet, then you'd need to basically restrict all of it, which considering this website is a pretty good news aggregate and banning its users from accessing it is in the interest of my government, I'm understandably conflicted on.
The argument that parents need to be better parents is one I find personally compelling. In the UK News thread, I also posited that parents don't want to hold the blame on themselves for why their kid became a fuck-up/murderer/whatever, and will often pin the blame on something/someone else in order to ease their own conscience. You see it all the time in America too "he a gud boy, he dindu nothin'", etcetera. Make parents more accountable, for starters, and make it acceptable to discuss the actual negative effects of porn (for now, how it might lead to one becoming trans is taboo) and you should see certain problems become mitigated.