I dislike the "it can happen on any street corner" comparison. It's apples and oranges.
The cost of harassing someone online, especially anonymously (even on HN) is virtually zero.
In real life, in person, the cost of harassing someone is many times higher. It's way harder to do so anonymously in person, it's way harder to do it without other people noticing in person, and it has to happen synchronously in person compared to asynchronously online. I could go on... it's just not the same thing.
> Ultimately parents and perhaps schools have to educate children on realistic dangers they can face both online and on street corners and supervise them until they are ready to responsibly use these spaces alone.
For the reasons I mentioned above, neither parents nor schools (on average) are equipped to mitigate online harassment because it's a relatively new attack vector on children. The average parent of a teenager (or the average school administrator, age 40-60) didn't grow up experiencing online harassment in their teenage years.
The danger I see in your comment is assuming that online and offline harassment share the same dynamic. The simple fact is online vs. offline harassment is wildly different in nearly every way. If you were harassed in real life, that doesn't automatically mean you understand the dynamics of online harassment.
Edit: Also feel compelled to say I'm not biased in any way. i didn't suffer from much harassment online or offline. I also don't have kids. It's like saying a Zoom date and a coffee date are basically the same. Or saying "dinner with grandma" is the same in person or via facetime. It's apples and oranges, let's not pretend they're comparable.