I think part of the problem could be that parents now control their children through bribery with sweets instead of physical "shock" discipline (smacking, etc).
I see it often, a child being dragged along by it's parents in a shop, the child crying for sweets like a heroin addict crying for his next hit. The parent tries not to appear weak in front of child in public, and tells their child they can't have that sweet, but a different one instead. The little bundle of hate gets it's sugar-hit either way. The parent makes sure to buy some chocolate biscuits for further bribery later when the little sod won't go to bed, because their child's health isn't as important as sitting in front of the TV with enough alcohol to put them into a stupor in peace.