The shift from editor-moderator content (which is what TV, radio, Pokémon cards, the Simpsons, etc. all are) to user-generated content with little oversight is quite a large one. There are certainly positive sides to it, but I think you can just brush aside the negative sides with "some nutjob in the past said crazy things about Pokémon cards".

Dangerous content on TV and from responsible YouTube etc. creators is filled with the cliché "don't try this at home kids, it's dangerous and you can hurt yourself!" warnings for a reason, it's because we learned that kids are kinda stupid and will copy stuff they see on TV. Some people seem to be re-learning that lesson.