all the scouts of my troop have used my mora's
only one has cut himself (twice) both times through doing things i had told him not to do. he now knows not to do them.
as for my step daughter shan who is nearly nine she has her own pocket and fixed blade knives, she knows not to use them without me right next to her to supervise but she is learning well.
As for my son he's still too young but i have the knives waiting in storage for when he is old enough.
I am firmly of the belief that teaching young people that knives are tools not weapons will prevent knives being used for violent reasons far better than legislation banning them. fortunately this is an attitude shared by my GSL and the majority of the scouts parents