Yes, just like the “Just Say No” campaign completely stopped children from using drugs and parents telling children to “save themselves until marriage” stop children from having sex.
That confirms my point - I'm saying that restriction, blocking access or making it a tabu never works, it does the exact opposite (and worse, because it builds a sense of urgency to have/experience the thing).
Instead of forbidding it, you have to teach the children about the actual dangers of doing the thing and how to do it safely, how to limit the damage and what are the limits they shouldn't cross - and the reasons for these limits.
Telling them "just say no" or "you have to wait until marriage" only makes them even more curious, and in many cases they will absolutely overdo it once they finally are out of the reach of their parents.
I agree with both you and the parent. Early on it's good to have restrictions, then phase them out as they're ready. At some point they need to be prepared to function on their own. Otherwise you might end up with 18 year olds acting like 12 year olds.
Because we know that adults who get addicted to deleterious drugs in adulthood didn't know the dangers of it, right? Sometimes availability and the wrong situation can land people in a lot of trouble. Finance is another area where despite knowing the severe drawbacks. People in the wrong circumstance may seek out loan sharks.
Not sure why you're bringing up drugs here. We're talking about webpages, not substances directly altering your neurochemistry.
But yeah, indeed - usually it's a fault of parenting. Instead of properly teaching about the dangers and responsibility (in case of weed/alcohol, or finance) they made it a tabu.
Point is, grown adults who "know better" fall into these traps too. It's not only about inculcation or knowing better. If it's there, despite all you know, sometimes you fall for it. That's the point.
That adults know better is a myth. They don't. It's not about knowing better, it's about being taught to be reasonable with the thing, and that takes long exposure to that thing, ideally with the support of a parent.
You don't get it. People trained, educated, fall for scams all the time. People in pen testing who know they will get hit also fall. There is a case for a moat or external protection.