Isn't that the way of humanity, you can tell, advise, till your blue in the face. But, most people don't get it until they're "burned" or hurt in the process. Since my daughter turned into a teen and a bit before that, she does the same thing. So I continue to speak my piece and if she still does it with bad results. I stifle, the urge to say, "I told you so" and just make sure she's ok in the end. Now, I just let her talk her way thru the experience in as supportive manner as I can muster. Being protective is one thing, it's a struggle for me to NOT be over protective.
The people who get burned by his royal nibs and his gestapo chief, obviously have to learn it the hard way. And then vent it out of their system......................eventually.