Those who are constantly screaming "Freedom! Freedom! Freedom!" .. are probably lacking in personal security.
As to why any parent would want to keep their pre-teens and young teens from the scourage of a deadly drug like pot, got me by the sneakers.
Seriously, though, I don't have all the answers; don't profess to.
But this OP -- Street Pot Is Irrefutably Deadly -- has quite a few. Did you read it? What'd you think?