This is an Appeal to consequences. If "P" weren't present then the outcome would have been different.
If P (gun is present), then Q (death) will occur. Q is undesirable.
Therefore, P is true.
This is obviously false. There are a myriad ways to snuff out the life of another human being, none of which involve a gun.
"The United States can pay any debt it has because we can always print money to do that." — Alan Greenspan
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