If I have opened fire in my home, I am afraid for my life. I could not care less at that point about the hearing loss, I just want to be alive at the end of the encounter, with the immediate threat stopped. The hearing damage will be a bummer later, but I really don't think noise should be a factor in choosing the HD weapon for you. It's sorta like if I had to total my car to avoid a fatal accident, or cut off my trapped hand before it falls off a cliff. Those situations are going to be real bummers, but I'll be alive at the end.
I don't mean to minimize the seriousness of major hearing damage. I'm sure it's a real burden. I just don't think it factors into a use of lethal force to preserve life and limb. At the range, by all means, I'm all about high-end hearing protection.
Beretta PX4 .40 S&W | Beretta 92FS 9x19 Para | Rock Island Armory GI 1911 .45 ACP | Colt Python 4" .357 Magnum | Colt 1968 Det. Spec. .38 Spc. | Ruger LCP .380 ACP | Daniel Defense M4V1 5.56x45 | Alpine M1 Carbine .30 | Steyr M1895 8x56 | Ruger 10/22 .22LR |1943 Izhevsk Mosin-Nagant M91/30 7.62x54R | Remington 870 12GA