I live in a small town with a gun dealer who is not particularly thoughtful about others. One year he had a truck-mounted cannon made for the fourth of july parade, and he fired it off numerous times throughout the parade. Everyone who didn't already have their ears covered, including so many young kids, doubled over each time it went off. He just laughed at everyone, even with kids crying on both sides of the street. People were talking in person and online about how their ears rang for days afterward.
The only people who could do anything about it probably have age-related hearing loss and don't see it as a problem. Same reason nobody does anything about extremely loud motorcyclists.
