I don't know about very young kids and M/A. I don't think that young kids have the judgement necessary that - and generally, a martial art will provide the ability to hit without having to think through the consequences each time.
On that one though... I sorta like judo. It's not a pure M/A in the fighting sense, it's more like a wrestling sport. At least initially (and kids training is more about fun anyways, and learning basic coordination).
Having some physical experience of this kind (IMHO) is probably useful without being as dangerous as the more direct stuff.
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