That is very true, but my point is that if you use good hearing protection for practice, you are fine. If you truly have to use a gun for self-defense, hearing loss is a small concern compared to being killed. And the brain blocking the perception means a person can still function in a gunfight. And BTW, .22 is quieter, but it is above hearing damage levels too. So no gun is safe without hearing protection, but you very likely won't have it in an SD situation.Their brain may block the memory, but the open ear canal doesn't block the blast from causing hearing damage
I have been next to a firing gun without hearing protection twice in my life. My ears ached for a while, but I can still hear very well. Think of all the soldiers in WWII, Korea and Vietnam. By all rights, most of them should be completely deaf. But most are not. That is not to say many of the them did not develop hearing issues after many, many rounds, but it is not an all or nothing thing.