To reply just as flippantly: We could take the same aproach to alcohol and gambling, drop all age restrictions and put all the responsibility on the parents, then businesses will truly be able to run efficiently.

Of course good parents have to be involved in raising there kids well but that doesn't mean we shouldn't subsidide education or restrict companies from sending kids down coal mines(even if they really want the money). Mostly because good parents can fail and bad parents exist and if society isn't going to aim for turning kids into good adults then it'll just get worse generation on generation.