So you saying those guys fired their weapons more than a dozen rounds in their military careers without hearing protection? I would guess those guys had been in quite a few engagements, not just one home defense situation. Small price to pay in my book for being able to stay alive.
That every round remark reeks of nanny state thought process. You said you met those folks, any experience in the military yourself with it firsthand??
I was in Iraq as an IT geek. Only rounds I heard/saw fired were indirect attacks fired at me.
I have done a bit too much shooting over the years without hearing protection though and have record-able hearing loss because of it, and that was not in an enclosed situation.
Anyway, I don't want to push anything on anyone. Anything I say here is just what I do in my house.