In the last 30 years, the number of guns U.S. has tripled, yet gun violence has gone down. If guns were the problem, you would know it.
You are going after one tool used by criminals, rather than the criminals. Look at London, they outlawed guns, and murders and terrorism continued. Then they outlawed knives, now it is acid, or bombs, or trucks. Nothing changed. They have the highest murder rates in their history. Higher than NYC.
Murder is already illegal and carries the highest penalties in the country, much higher than any gun law. Has that stopped anyone?
Crazy people will just use a bomb or a truck or some other tool. Not one gun law so far has ever stopped a crime or prevented a mass killing.
As I said, gun laws are feel-good laws, not do good laws, they neither solve nor prevent anything. We need more done on mental health issues, following up on red flags in schools, better police follow-up on reported suspicious activity and enforcing the laws we already have. Most of the mass murders in the last few years have all had warnings that were missed by law enforcement. Most of the perpetrators should not have been able to own a gun in the first place under existing law.
You will never convince me that gun laws deter criminals or determined crazies. All they do is annoy and infringe on the rights of law-abiding citizens who are generally not the problem.