It is already apparent in statistics, The more guns are present in a country, the more people get shot.
In Western Europe there are few guns and few people get shot. In the US there are guns all over the place and many times more people get shot.
In Japan there are almost no guns and almost no one gets shot.
That is the proof.
This is a low quality of proof.
This is an example of Post hoc ergo prompter hoc, a logical fallacy.
It also relates to a Chicken and Egg argument .
Where there is a lot of danger , people tend to buy more guns to get relief.
So which happened first , the danger , or the guns sales in response?
Even where there is both many guns and many shooting injuries, like Chicago,most of the guns are not being used irresponsibly. If 10% of the people are doing most of the shooting , then it should be possible to remove better than 90% of the guns from the situation without reducing the number of people injured at all.
This would require of course that you remove the guns from the responsible people first and leave the 10% that is troublesome armed .
Of course , were it possible to remove the guns from the irresponsible first , then each gun removed would be an improvement.
Unfortunately every gun restriction I have ever heard proposed would have the preponderance of its effect on the Responsible before the irresponsible.