Kids swearing

I really hate it when kids swear at each other. that day i went to pick up my little sister from school, and the amount of foul mouthed children i had seen was unbelievable, they were swearing at each other really loudly. They had no consideration for no one. I mean even the teachers were standing their, but no one not even one of the parents turned out to tell their kids not to swear. Kids should be sweet and innocent, but when they swear, it dont look or sound good!
http://www.kidsbehaviour.co.uk/ChildrenAndSwearing.html