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Ken, I think what you say is true, there will always be, have always been, those who disrupt and stray from a more acceptable path. We need to accept that fact without accepting the behaviours!!
Andy - poor parenting comes into it, but as the mother of 4, 3 of whom are still teens, I can vouch for the struggle there is with all the other pressures on teens, which seem to have increased so much in recent times. My son is a real gentleman who had a mere nano-second of a teen-blip, my daughters have had their moments (anyone with daughters will recognise the truth lurking behind those mild words!!) but on the whole are turning out ok - some more than others!! Consistent and firm parenting limited the damage that could have resulted from teen years, but it really isn't easy!! It isn't helped by, as you call it, the PC approach. I hate it when we get phrases like "pc gone mad" because I don't think it helps or accurately reflects the real and genuine positive purpose behind the drive to improve our society, but when it comes to child-rearing I am the first to use the despised words! No effective sanctions, no support from authority groups or figures, no real punishments or proper rewards (it is hard to reward a group that pretty much has all its needs met!!) lots of really appalling role models who run amok and get rewarded for offering our kids absolutely no incentives to behave well. As you can tell, I feel strongly about it!!