Sad
Even as a young teenager (long before the WWW) I knew that electricity is dangerous above a few tens of volts or at high currents. I had a Neon sign transformer and I did experiment with it, but I always had it on an insulating surface, stepped back, plugged it in and switched it on at the wall outlet, and unplugged it before working on any part of the circuit. I also used a shorting stick on any HV capacitors before handling them. I'm still here because I didn't want to become a crispy critter so was careful and methodical, especially when working with stuff like my 1600V dry battery bank.
Banning electrical videos from Youtube will not help, as the information is out there in so many other places including books and university websites, (e.g.
http://wonders.physics.wisc.edu/jacob-s-ladder.htm) often with no safety warnings.
At the end of the day, its the parents responsibility to teach their kids to assess risks and consequences, and forbid excessively dangerous activities for their individual experience level. Excessive caution on the part of the parents is counterproductive as that produces a young adult who is at risk as soon as they are old enough to ignore their parents and 'cut loose'. Safety lessons in school can help, but the bright kids that are most at risk are often several years ahead of their grade in subjects that interest them so are likely to be experimenting before they've had the safety lessons.