I'm questioning why we're still having hearings about this because I don't know the answer. I'm further questioning why, of all the people who work so very hard for the people who suffered in 9/11, THIS guy gets an invitation to Congress, especially given he's a first rate jackass, this particular issue not withstanding.
I don't know either, so I googled it. Seems since he has a voice, he has been an activist for 9/11 responders. Here's him on the today show a year ago: Jon Stewart joins former 9/11 responders in call for health care
Here he is doing the same, earlier this year: Jon Stewart, advocates for 9/11 first responders are tired of visiting Congress