I think people over 21 should carry a firearm for protection because many citizens think that it is better taking care of themselves than the police.
It may take a long time for the police to respond if someone is assaulting you or any other violation.
It won't be that easy to have a firearm of course, they would have to go through the government to have a background check on the person.
I think people above 21 does"t need a weapon in house , there are many cases in which a guy gets guns and kills everyone in schools or other public places . Also I think that people doesn't need to protect them self's , we have the police to protect people and also always in conflicts cops work gets harder when the criminal have a weapon to protect himself , they make things harder. Also if we could get a safe community we don't need guns and other weapons for personal protection , policeman and the government should keep people safe . I think we don't need guns in houses , this creates more conflicts in the society and in wrong hands can cause a disaster .
If you have your gun legalized and have special permission from the government which you will need to be trained by police officers, not only on firearms, but in self defense classes. Having permission to have a firearm requires a psychological and physical exams. If you have noticed all the people that go to schools and public places to "hunt", have psychological problems and they don"t think on what they do. it may be easy to buy one, but not to legalize
please go back to topic on 21 year olds can use weapons.
People can be trained and check many times by the government but always people can get guns some how , people can make things happen and they can cause a disaster like some years ago in the Batman movie , or in schools like the ounces we see recently . Yes crazy people make this , but also people can get the permission and later on get crazy or against something and with a gun they could many thing happen . Maybe we could change the year of permission to 25 or something or really check people and try to make a safer society
Remeber what i said that they have to pass a test and the government isn"t that dumb and would not let buy any gun. Once a person have internal problems they can scan it on the way he acts while testing. Many people now in days are very more wilder than back then most of the people react to fictional movies. When a person is given a registered gun it has a barcode that can lead to your personal information, even inside the bullets that are assigned to you.