Personally, I think there is a teaching moment when someone has first developed tinnitus and is seeking out advice, usually on the internet.The apathy you describe is utter insanity.
Among what they learn should be the fact that research funding for tinnitus is limited, their support no matter how big or small is needed and they are encouraged to become active politically by supporting efforts to increase government funding.
I'm US based and the political activity is something I wish ATA would involve members in. I'm more that willing to write letters or send emails.
That's something that has worked very well locally where I live. The city was about to cut grants to one of the organizations that runs a program for homeless children and their families. The organization asked its volunteers to send an email to our councilmen. They even included a template because it's more about the amount of emails the official receives rather than every one being uniquely worded. It was effective.