With regard to the Dwyer suicide, it got plenty of network coverage--though they didn't break in to mention it. The combination of actually having video and the very public way he did it made it a huge news story.
Same with Christine Chubbuck and her live 1974 suicide on local Sarasota, Florida television. It was seen by a small handful of viewers BUT it made national news.
Someone earlier mentioned the death of Whitney Houston. I don't get it either. Her death wasn't much of a shocker to many folks now Michael Jackson, Elvis, John Lennon and many others were shocking.