How many parents would seriously consider stab proof body armour for their kids to be worn under clothes on a regular basis? combined with parkour and
'Serious' ie krav maga (what they teach mossad the Isreali Secret Service), Ninjitsu (as in assasin ninja) martial arts
How many would want their kids carrying something like pepper spray or a taser if they could?
Given the levels of knife and other extream violence