It can be as simple as, ‘they don’t know what they don’t know’, some if it being very important. There is also the thought that, ‘it won’t happen to me’, or invincibility. Most of us have done stuff as a kid that could of easily ended up sideways. I’m use to being considered the old fuddy-dud for mentioning potential consequences of certain actions. One deals with probabilities, there may be that 5% chance of a serious crash, is it worth it? Some think, it’s a 95% chance I’ll be just fine. With those odds, eventually your number will be up.