Saying "it's dangerous" would be pretty accurate relative to other "normal" activities. You don't have to have experience with it to even guess at that.
No, cliff-jumping is not the same, but it's the same principle as the sky-diving. It doesn't take a genius to figure out it's not a good thing. Neither does it take "experience" to know it.
I deliberately used skydiving as my example, because it is a thing that not everybody does, but very, very many people have done it. And when it's paratroopers jumping to defend my country from an enemy, it's always a good thing.
Fear without experience of a common activity that normally does NOT lead to negative consequences is just prejudice, which is based on ignorance. I'll admit that when it comes to jumping out of a perfectly good airplane, can I get you to admit that about drinking a beer?