But if the world were perfect, we wouldn't need guns in the first place, now would we?
Hemingway's own family knew he was manic, depressed, and a danger to himself. His wife had locked up the guns and didn't think he could find the key.
She was wrong.
The 2nd Amendment is no more responsible for Hemingway's suicide than Ben & Jerry's is for Rosie O'Donnell being a fat lesbian.
I don't need guns. I like them. You're confused. Yours is a statist mentality that dictates when the citizenry will be allowed to own guns, viz. according to "need."