One of the guys made the comment that you should occasionally train by firing your weapon with no ear protection so you are prepared in a real life situation.
(Hows often does the person say this).
Only if you want to damage you hearing.
A single exposure to some calibers can result in permanent damage.
I will risk it when lives are at stake, but only them
You'll never hear the gun, let alone have it affect you.
Even if your brain blocks out the sound, the ear is still being damaged.