Kids brought knives into our high school when I was a kid. I always had a Swiss-army knife. Never an issue. Kids would never THINK to use them to attack another person back then. Now, you're expelled and arrested if you even bring in a knife. Heck, kids even brought in guns sometimes. Scenes from Porky's were re-enacted, there were Kissing Booths. Back then, many things were okay that you'd get arrested for now.
It's just that you can't like, turn on an old movie/cartoon you grew up in from the 1980s, and think it's all innocent because you lived through the movie and didn't act up. Or you acted up, but it was okay back then. Now if you take a naked picture of someone's girlfriend and put it on the bottom of a pie, it's not just teen high-jinks, it's a lot more serious.
What I think I'm saying is that you need to re-watch them so you can re-evalutate it from today's perspective and be able to parent from that - instead of the perspective you remembered.