teacake - // @10.31 my kids have all grown up, married with there own families, very upstanding, and don't go, and have never gone about threatening to stab other members of the public. your getting a chip on your shoulder even now because I don't agree with you on this subject. //
No-one is suggesting for a moment that threatening to stab people is acceptable behaviour.
The point here is, headbutting someone is not acceptable behaviour either, and the behaviour of one individual in this scenario, does not excuse the behaviour of the other.
If you think it's OK for your children to be assaulted, then that's for you to live with, but disagreeing with that view does not amount to have 'a chip on the shoulder'.