What are reasonable gun laws in your opinion?
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I personally have no problem with the 18+ to buy and using a background check to keep guns away from crazies and known criminals. (whether or not they should be in jail instead of in society if they can't be trusted with a gun is a different question)
Admittedly, I am extreme on this issue, but not without much thought. I believe the Second Amendment is an absolute, fundamental and intrinsic right that defines Freedom.
That said, there should be no restrictions on any free people to Keep and Bear Arms. If you are not in prison, a minor or adjudicated mentally insane you have the Right to Keep and Bear Arms as much as the right to speak your mind (Freedom of Speech), write down your thoughts (Freedom of the Press), demand a trial when accused of a crime (Due Process) or any other of the rights stipulated in the Bill of Rights.
A minor can have their Right to Keep and Bear Arms restricted just like they can have their Freedom of Speech and Religion restricted: a parent can punish their child for swearing or force them to go to church, etc. As a result, minors are not truly Free. That is ok as they will grow up and become truly free once they are old enough to accept the responsibility of being free.
Also note that since minors are not completely free they are not completely responsible for some of their actions- juvenile convictions of certain crimes are automatically expunged.
As for convicted felons, I believe that if someone has done their time they should be fully-functioning citizens again. If we can't trust that person with a gun, we cannot trust that person in a free society, period. Repressing a released-felon's Right to Keep and Bear Arms, or any other rights for that matter, simply creates a caste society where some people have more rights than others. As a result, the entire society is degraded.
With regards to those adjudicated mentally insane (not just eccentrics who choose to live their life differently, but people formally adjudicated insane) these people are analogous to children. They lack the judgment to exercise their rights, but in exchange they are absolved of responsibility of their actions. Someone can be "not guilty by reason of insanity". These people are truly innocent, in the strictest moral sense: they cannot be held accountable for their actions as they do not have the wisdom to be independent and free. We, as a society, have the duty and obligation to protect these people from outside harm and from themselves.
One last comment: those people that can have their Constitutional rights lawfully repressed through Due Process still have their rights technically. Their rights still
exist, but are lawfully
repressed. The Founders chose their wording very, very carefully.