If your home is a small apartment in a building with small apartments all around you with walls that are essentially a thin sheet of cardboard, and the gun owner hears voices that aren't really there, is it still fine? (and suppressors don't even factor in at this point since they are essentially just hearing protection)
I don't think there is a universally applicable rule where it is fine or not-fine. Factors like the individual(s) involved, the location and even social climate make such a big impact when it comes to weapons. Probably also why there is a blanket ban on suppressors, not because it was actually based on the use with common sense.