Careless youngsters and bike riders do not belong in one sentence.
I think everyone should learn these stunts. You never know when you will see a girl and will need to impress her with a wheelie or racing.
Its also a good way to make friends and have them like you. They will really respect you once you lift the front wheel of your bike.
Most importantly, your family will be in awe once they find out your putting your life at risk everytime you perform one of these stunts.