Are you still thinking of all the things that could go wrong? Good!
I assure you that hoping young people have parents who help them use the internet in safe ways (and not too soon or too much) leaves a LOT of kids vulnerable.
And "kids just shouldn't be online" is also not a solution.
Part of the reason online spaces are so toxic for adults is we just won't THINK about this or teach anything and expect people to "get it" without any education.