Soldiers are issued hearing protection and are required to have it on them at all times when in the field. The VA is taking an increasingly hard-line position on paying disability for hearing loss, you have ear plugs, if you don't use them it's your fault.
There are a few mitigating factors to consider. On the modern battlefield, it's really better to use earplugs. It's not just the gunshots that are hazardous. There are engines of all types, equipment noise, etc. There are combat vehicles that are so loud that just being inside one is a noise hazard. You are much more likely to be injured because you DIDN'T wear earplugs than because you DID. Also, there are modern protection options, (both electronic and traditional,) that actually do a very good job of canceling out harmful noise while allowing normal noise levels.
But this is different than home defense. Soldiers have time to prepare their gear. If you have to grab a gun to defend your home, you MAY have time to don hearing protection, but I can't imagine it. I won't mock someone for keeping earmuffs next to their bed, but I don't do it.