I go dancing a lot and sometimes I wonder if my hearing will be damaged from the loud music. Why should I have to wonder this? Don't I have a right to know if a band or DJ is playing their music too loud? It's not subjective - it's science.
Pass laws that require music venues to maintain public sound meters both near the speakers / band and on the opposite end of the room/venue. These meters should be easy to read so that even an idiot will know whether the sound being produced is within a safe level to prevent permanent hearing loss. At least at that point it's a matter of choice, not chance.