How about when you need to maintain situational awareness, or don't have time to don hearing protection, as in a home defense scenario? I want suppressors on the firearms I will defend my family with because I don't want to damage my hearing or my family's hearing when I shoot an intruder. Also, softening the muzzle blast a bit and diminishing the flash is going to help me avoid the otherwise disorienting effects of shooting a firearm in an enclosed space.
This has actually been a concern of mine in my apartment.
I live in an old brick building that was cut in half and the other half moved a couple blocks away...
Anyhoo, most of my walls are either concrete or cinder block.
A 10ga or 12ga magnum shell discharge in the house would be outright painful for everyone involved, let alone the poor bastard that got hit by it.