i don't believe parents should hit their children, but that's another story as they say, it's the fact many parents don't engage with their children, read stories to them, and care about them in the way you should. Neglect, bad parenting skills, and the fact its been generation led, one after the other.
If there are little or no parenting skills, how will that child then grow up and know how to be a parent to their child, they won't, only see how they were treated as a child, and so on. Perhaps its time to really start taking the problem of unruly children seriously, and start with the the parents, before the child comes into the world, a degree of discipline, structure, love and nurture are what makes a reasonably well balanced and happy child. No should mean no, not give in to every demand, and that sadly is how life in Britain has become for many