Re: Bad Advice and Self Defense
FWIW, my kids (9 and 4) do judo. Judo is not expressly about self defence/defense, but you do learn some very, very good basic structure upon which to build a sound method of self defense. Same with many forms of BJJ.
I think though, for younger kids, you can't beat the standard and very proven Kodokan method of training at that age.
It really stresses the fundamentals that need to be learned at that age in a safe, constructive environment.
Sure, striking arts are okay, but I think they are really not dealling much with the reality of what you will deal with in a self defense situation where someone is seriously trying to impose their will on you.