I do want to say: While I agree tinnitus is far more disabling and serious than the public realizes... I suspect there was more going on with this shooter than ringing in his ears. Tinnitus causes serious psychological conditions (hey, it triggered anxiety attacks for me when I had no previous condition). But that's not the same as being chronically mentally ill.
I often see posters saying tinnitus caused Van Gogh to cut off his ear. Who knows? But Van Gogh also suffered epileptic seizures, probably was bipolar or clinically depressed, and was hospitalized for some time. He also had a serious absinthe habit, which didn't help him any.
I would hate newbies to jump to the conclusion that today I have tinnitus, tomorrow I will be for a ready for a mental institution. On the other hand, if you find your tinnitus is causing you serious anxiety or depression, get help. I did, right away. Cognitive behavioral therapy, coupled with temporary meds, was one of the best things that happened to me. You can't deal with tinnitus when you are freaking out.