The medical literature contradicts the statement that one loud exposure won't cause permanent damage. Please refer to the peer reviewed literature as compared to the opinion of one person.
Second, if someone said:
In fact, many people in true life or death situations experience auditory exclusion syndrome and don't conciously hear the gunfire at all.
and claim to be an expert, they are incompetent. Auditory exclusion, perceptual narrowing or selective attention are psychological effects and NOT a measure of physiological protection against pressure. They need to go back to basic Sensation and Perception class.
Last, attend me - posters should cease and desist stating that gun shot level noises cannot cause damage with one shot or that you need repeated shots. We have banned folks for such as it promotes dangerous actions. We take similar actions for those who promote illegality.
There are no excuses for such postings.