But such videos (Electric Fences, or Van de Graaff generators and similar), can be important and useful, because they teach people how electricity works. Also, by seeing their lively reactions, people learning from such videos, are much more likely to remember the importance of playing safe with high voltages.
In other words, it perhaps could be argued, that by banning/deleting such videos on YouTube. It maybe risking vital safety information/lessons (such as for the dangers of high voltages), from being missed by some people.
I'm not happy that they deleted that video, you mentioned. Although I'd prefer to know the exact details of the complaints about it, and let YouTube explain why they took that video down. Before blaming YouTube or accusing them of making a mistake (although me saying that is hypocritical, as I made this thread, which does just that).
E.g. Perhaps it was taken down for different reasons, such as a copyright claim/dispute.