Firearm rights have not been paired with firearm responsibilities.
No demonstrable knowledge of firearms including handling safety, bystander awareness, accuracy in target acquisition and engagement, diagnosed and undiagnosed mental illness, prescription history, comorbid condition, illicit drug use, follow up proficiency testing intervals, social media history validation, or personal reference is required.
We (USA) do not drug test for weapons sales, we do not require a psychological exam, we do not query historical violent social media posts or threats of violence, we do not require basic proficiency in weapons handling and securing, we do not have a universal school access policy and threat assessment by trained law enforcement. We have none of these mechanisms in place, yet expect oppressive legislation to end the violence which can not be effective without confiscation and a complete ban.
It has been reported that humans have been at war, defined as an active conflict that claimed at least 1,000 lives, for 3,132 of the past 3,400 years or 92% of the time. It is a strong bet to bet on war amongst populations and not universal peace.
To assume a sudden, sustained peaceful co-existence amongst groups is counter to multi-millennia trends. Violence is the norm both in advanced civilizations as well as the animal world.
Desensitization through television, immersive first person shooter video games, and glorification of violence through music has contributed toward making non-military interpersonal violence events more frequent.
Rights must be considered in the context of responsibilities and our society should provide mechanisms to insure responsible use. 393,000,000 firearms won't disappear due to a ban based legislative effort and unfortunately nor will this unacceptable carnage.
It will require a societal change toward a renewed interest in science, technology, curiosity, philosophy, art, music, nature, exercise, empathy, and disconnecting from passive information sources.
According to the ATF,
(1) Has been convicted in any court of a crime punishable by imprisonment for a term exceeding 1 year;
(2) Is a fugitive from justice;
(3) Is an unlawful user of or addicted to any controlled substance;
(4) Has been adjudicated as a mental defective or has been committed to a mental institution;
(5) Is an alien illegally or unlawfully in the United States or an alien admitted to the United States under a nonimmigrant visa;
(6) Has been discharged from the Armed Forces under dishonorable conditions;
(7) Having been a citizen of the United States, has renounced his or her citizenship;
(8) Is subject to a court order that restrains the person from harassing, stalking, or threatening an intimate partner or child of such intimate partner issued after a hearing
at which notice was given to the person and at which the person had an opportunity to participate, and includes a finding that the person subject to the order represents a credible threat to the intimate partner or child or the intimate partner OR explicitly prohibits the use, attempted use, or threatened use of force against the partner; or
(9) Has been convicted of a misdemeanor crime of domestic violence cannot lawfully receive, possess, ship, or transport a firearm or ammunition,is prohibited from shipping, transporting, possessing, or receiving firearms and ammunition.
A person who is under indictment or information for a crime punishable by imprisonment for a term exceeding 1 year cannot lawfully ship, transport, or receive a firearm or ammunition. Such persons may continue to lawfully possess firearms and ammunition obtained prior to the indictment or information, but cannot do so once the conviction becomes final.
[18 U.S.C. 922(g) and (n); 27 CFR 478.32]