Some "children" actually do have common sense... And self preservation. There are also adults who can behave just as stupidly as teenagers sometimes as well. Dares are fun, you just have to know if you're anywhere near ready. I know that my horse and I would be nowhere near ready to do any much more than bareback because of his lack of responsiveness and hotheadedness. So saying children are stupid and have no common sense is a stereotype and if you're going to say that, you should include stating that there are exceptions..
While there are 'some' exceptions you have to remember that children do not have the physical brain capacities as adults, and one of the last parts of the brain to develop is the 'common sense' part, the part that tells you you're going too far and keeps you safe.