Because there are always moral panics, always some "thing" that's corrupting the youth, be it television, rock-and-roll, D&D, video games or now social media, and people keep thinking giving in to the moralists will protect the children.
But the moralists are never satisfied, and their war on free expression, art and culture never ends.
You’ve got the 80s and 90s covered. But you’re missing the more recent post-2016 moral panics, like being able to listen to an episode of Alex jones, which spurred the current issue in tech especially YouTube.