You're right, Chatty. Many teenagers think they're invulnerable. The "That could never happen to me" attitude was particularly prevalent at the middle school when I was teaching there. They could have been in grave danger any number of ways and never noticed.

We set what we thought were reasonable limits on our kids, and they grew up safe and happy. In my experience, "strict" doesn't always work, either. Some of the saddest stories I know are about kids who rebelled against their parents limits. It really is a slippery slope out there.