I got some nice ear plugs designed for concerts (Loop) because I go to a concert and I already have mild tinnitus and don't want it to get worse.
I do not know why concerts have to be SO LOUD. Loud, sure. Permanent ear damage loud, why? It should tell you something that the guys on stage wear ear plugs.
That's a really good point about hearing damage vs eye damage, the only thing I can think of is it's a lot harder to measure and people don't care as much. It would be really hard to prove you had hearing loss in a court of law, let alone that it came from one specific event, and you'd have a much easier time proving that a high powered laser blinded several people, perhaps. And nearly 100% of people would choose "deaf" if they were forced to pick between that and blind.