It's not unreasonable to not be sure on things like this. Personally, I think education is important, but can only ever go so far and that environmental controls that make the risky things harder to do will do a lot more. Most have done things that we've been well educated would be bad for us that we probably wouldn't if the bad things weren't so easily available.
My oldest had some internet trouble when he was 13. He did it all on a laptop when in the same room as me or his father. We thought the talks, being open about everything including the horrors of the internet, setting ground rules, being there and some basic blocks were enough, certainly better than the no supervision my DH and I had from our parents. They weren't enough though. When we asked DS why even though he himself said some of the stuff he saw over those few weeks he says himself was upsetting and disturbing, he said because it was so tempting and easy. He certainly seemed to feel like he should be able to handle whatever like an adult and it was all right there.
So, we had a lot more talks over the next few weeks and - at his request because of the temptation - we used ScreenTime to block the internet browser on his phone and removed a couple media apps and he can only use the internet browser here on the main computer that is attached to a TV (far less tempting to do when everyone can see it). It's been over a year and those are still in place. I've recently asked him and he still feels not yet ready for open access. I respect that. He now has a few internet apps we monitor (including Instagram which he asked for after taking a photography course), but we didn't really have any of the pushback or rebelling people say will happen even before that when all he had was essentially a feature/brick phone with some books on it. That may be his personality though.
I do not get the whole 'they can do it at school or friends' as a reason to make things easier to get within my own house. It reminds me of growing up where it was just expected for kids to drink and had the whole 'if they want to, they'll do it anyway" and thought they were being better and more modern parents by supplying and allowing kids to drink in their and their friends' homes when really without ease of access, there would have been a lot fewer kids who had drinking problems in that area. I'll never forget coming home to my sister (who did not live there) and her friends all absolutely shitfaced - they were 11ish. Most people I've met since I talk about this with think those parents ridiculous, but really, the lasting impact and mindset isn't much different to many with kids using internet-enabled devices.
We don't block off all waterways, but throwing weak/non-swimmers in at the deep end - while something we know happens - is still generally frowned upon as a shitty and sometimes traumatizing way of learning to swim. To me, that's what is happening with too many kids and young people on the internet which, as the video above says, doesn't have a shallow end. I'm all for education, but the idea that talking about it will ever be able to beat temptations, I just don't think that's realistic even with the most compliant kids.