Just because Scouts Canada says we can do something, doesn't always mean that we should. (i.e. We can take them on back country excursions if we complete the proper paperwork but we've all heard of groups who have done that without the proper skills base, and ended up in trouble.) Likewise, lots of people think that we have no business taking our Beaver Scouts camping because they're too young. Our group says bull-pucky to that! One of the guiding principles of our group is always to know our youth (and our leaders) and guage risk based on that knowledge.

(BTW - Explosion may not be an inherant risk, but in the hands of youth who give a higher priority to what's funny rather than a proper risk assessment, it's a definite possibility.)