If at age 18, you can vote, get drafted, serve in the military, sign legal documents, and tried as an adult...why not?
I believe the philosophical rationalization and argument for denying some rights while allowing some privileges is along the lines of
1. 18-year-olds ARE mature enough to be responsible (military service, vote, motor vehicle operation, etc.),
AND 2. 18-year-olds ARE NOT mature enough to be responsible... because GUNZ!!!
Obvious, egregious logical contradictions (and the fact that there is no evidence to support their position even if it had some logical basis) are no impediments to statist tyrants who are determined to control the ignorant masses (for their own good, of course). Disarming the civilian population to the greatest degree possible simply aids and abets them achieving their goals in the quickest and most efficient manner possible.
14 states now have a version of "Constitutional"/permitless carry enacted, and half a dozen states still have bills active this session to enact the same. This does not help further the progressive statist agenda. They cannot be pleased. Extending the right to 18-year-olds is just another thorn in their sides.
