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I think your second "belief" there is a consequence of something deeper. Namely - your first. By "organised" don't you mean compulsory or coerced? We shouldn't coerce (is the moral principle). If we did that, then such "bans" wouldn't be necessary. Indeed they'd *be* coercive!
Sorta? Free play among children doesn't seem to cause as much consistent damage to the head as many team sports, and this may have something to do w/ kids not loving the feel of injuries that cause brain damage & therefore not generating rules that cause that to happen a bunch
Only 25% from sport, most over 10 years old: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2492044/ … My guess is it's hard for little kids to get head injuries because they can only have low momenta. Something to be said for parents pushing kids harder than they push themselves at these organised sports.
FWIW: I played "non-organised" rugby league as a kid. After 6ish years of play, I never so much as bumped my head. No more risky than normal "rough house" play teenage boys get into. There's something that raises the stakes with parent spectators watching that makes it worse.
Still, compulsory or no I am a 
for those sports
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