I never have much luck with telling people they are riding like morons. I have a very hands-off leadership approach, however. I mention to my guys that they are riding dangerously, give them examples, provide them real-world examples of what happens, and then leave them to learn.
No amount of harping will make someone truly understand something. They can either take your word for it or they will learn the hard way - which they will remember for a long time. I've only had to kick a kid in the chest once to get a point across and he didn't really learn even then, only resent my teaching method. He knew I was serious though and didn't act stupid when he thought I was around. :spank:
I'm not a big fan of our modern society and the socially acceptable levels of getting physical with someone. What used to be a friendly, educational beating has been turned into assault....