Again, no, you didn’t prove that guns are a necessity.
Eating is a necessity, clothings are a necessity, people in your own country don’t have a gun and make it through life and die of natural causes, that’s all the proof you need to know that no, guns aren’t a necessity, they’re a desire that you and others have.
To make it so you don’t desire them what is needed is a solution to the social issues that make you want a gun.
Another proof that guns aren’t necessary for that is that there’s already more guns in the USA than people and it didn’t stop that person from trying to attack you even though odds were that you would be carrying. Increasing the number of people who own or carry a gun won’t improve things, there’s already more than in any other rich country and the issue is still worse.
We’re not even talking about the statistical improbability of the situation you’re basing your opinion on, if you go by that logic you should be arguing in favor of getting rid of all guns because of the odds that you’ll get murdered with one and you should never take a car ever again because of the odds that you’ll get into an accident and you shouldn’t have a kid because of the odds that your girlfriend will die in labor or your kid will die at a young age (especially in your country in both cases) and the list goes on and on…