I too have never had an issue.
If I was in your position I would use this as a good opportunity to provide a critique of the reaction of schools and also list clear facts for worried parents, as Richard suggests, in your article. Statistics on the incidence of crime for example would be helpful in dispelling the many myths created by publication bias.
As an aside, I think the headline of your post can be misleading because when I read it my interpretation was children are being taught physical means of repelling an attacker, as opposed to sensible steps to avoid the risk of being attacked. I think the former would be a very bad idea, as I suspect the probability of an attacker being better equipped - in every sense - than a 'middle class' child is pretty high.