Why are teenagers subjected to this kind of stuff anyway? It's usually pretty apparent that they don't like this stuff. They won't tell you outright, because they're trained to be compliant and taught to never entirely disagree, but it should still be apparent to those who understand teenagers, no?
As the parent of a teenager, I now realize just how hard it can be to get some messages to really land with a teenager. Unless the message that you're trying to get through, no matter how important, is already something that's of interest to them, most things end up feeling like a lecture to them. Upon reflection, I was the same way. As a result, you (the parent) sometimes try to make things "fun" as a way to engage with them and drive home a message. (spoiler: it often turns out lame and not fun...)
It's horrible! I always hated this kind of stuff in middle and high school. I think that it's a combination of school administrators being out of touch and having pressures from their higher-ups. But for the sake of today's teenagers, I wish these sorts of trainings and assemblies were done away with.