Because parents are too worried about being their children's FRIENDS rather than their PARENTS. They are too worried about their children liking them than being the "bad guy".

Let me tell you, I've seen enough "Bad parenting", even in my short days, that I am CONVINCED I will learn from others' mistakes, and my children will NOT!!!! get away with half the cr*p kids get away with nowdays, especially in public, and ESPECIALLY with how they treat others!