It actually doesn't matter to me if Senate hearings are aired on television. It dosen't matter to me at all if shows should be aired on television as long as it's interesting. If it's interesting, then I'll watch the show. If it isn't, it might be to someone else, so I just don't watch the show and watch something else.
I don't think there really are limits to what is aired on television. People rate things like movies and tv shows as "G", "TV G", "PG", "PG-13", and "R", but that doesn't stop teens and children from watching certain things. Most parents don't monitor what their children watch anyway. Plus, it doesn't even make any sense to rate things if people aren't going to monitor wath is being watched on television. If people don't spend time reading the rates, then why waste your time trying to make the rates.