You could show deer hunters a video of a heard of deer grazing in the middle of a firefight and they would say gunshots scare them off. If cars whizzing by them while grazing along the side of the interstate doesn't scare them because they get used to it then they will also get used to gunshots. I have a private range and have deer walk by while we are shooting but the hunters who hunt the land surrounding mine are always complaining we are scaring the deer away.
It's the disruption of serenity that corrupts their judgment. I know better, but there is something about guns (other than the hunters), going off that screws with the psych. I admit, unnerves me too.