When you can prove that more gun restrictions will indeed save lives I will give you a number.
Some time back it was brought up that Australia's gun ban was so great for their country and that it nearly did away with this kind of crap. But it isn't true. Australia's gun ban did nothing for the murder rate.
In the 20 years prior to the Port Arthur shooting, Australia had 77 people killed in massacres of one type or another. In the 20 years following it, they have had 76. The only thing that changed is that Australians now take the more culturally sensitive approach of locking people in buildings and lighting them on fire, or running them over with cars. On a side note, 5 of those massacres were shootings. The 2014 Sydney Siege (3 dead), The 2014 Hunt Family Murders (5 dead), The 2011 Hectorville Siege (3 dead), the Monash University Shooting (2 dead), and the 1999 Wright St Bikie Murders (3 dead).
https://en.wikipedia.org/wiki/List_of_massacres_in_Australia
The 1996-97 National Firearms Agreement (NFA) in Australia introduced strict gun laws, primarily as a reaction to the mass shooting in Port Arthur, Tasmania in 1996, where 35 people were killed. Despite the fact that several researchers using the same data have examined the impact of the NFA on firearm deaths, a consensus does not appear to have been reached. In this paper, we re-analyze the same data on firearm deaths used in previous research, using tests for unknown structural breaks as a means to identifying impacts of the NFA. The results of these tests suggest that the NFA did not have any large effects on reducing firearm homicide or suicide rates.
http://melbourneinstitute.unimelb.edu.au/publications/working-papers/search/result?paper=2156271
And no one is saying "do nothing". Just leave the constitution alone.
You want some suggestions?
Do away with the law prohibiting guns in school. Allow teachers to carry if they want to. I can carry in my place of business. Why can't they? There are kids in my store from time to time, none of them have been hurt by the guns I keep around. I don't have a problem with college educated adults exercising their rights in a school.
If a teacher wants to carry I think entry level courses should be paid for by state government and their CCW license can be written off as a business expense. Firearms and accessories can be purchased with the same discounts law enforcement gets.
The NICS system should be done away with. It is needlessly cumbersome, and as we've seen in this case doesn't always work.
When you buy a gun you have to fill out all of the paperwork, answer the stupid questions (that a criminal will lie about anyway), and have a background check done. And it is only availabel to FFL's.
The NICS system should be replaced with a prohibited persons database kept by the FBI. Similar to the "no fly list" you wouldn't need a background check, just see if your name in on the list if it is you aren't getting on a plane.
Simply type in a persons state and driver's license number. Does it match the person's name and birthdate on the screen? If yes the computer would tell you whether or not they could own a gun. It could be used by people doing face to face sales as well as FFL's.
States would be required to submit updates to the database weekly, and held responsible for failure. Face to face buyers would be required by state law to keep a record of who the gun was sold to for a certain number of years.
Something else that could be done, and I'm sure I'll be called out for the barbarian that I am for posting this. Try these people, give them an appeal or two, then take them out to the court house lawn and hang them. The sight of a body twitching at the end of a rope might be a good deterrent for the next kid who looks at these murderers as role models.