This is a completely worthless example of a foolish backwards argument. "mature enough to make one decision" (join the military). But not mature enough to make a decision to carry without, the same could be applied to any other person of any age group....
"Carry without" what?
What can be applied to any other person in any age group?
Can you please clarify why you think it's a worthless, foolish and backwards argument in a coherent paragraph?