Well, some of them just have overblown mild issues, the kind millions have. Say, Fry had some depression -- well, more than one in five people had similar experiences, and the kind of depression that still lets you have a long, succesful career, star in movies and tv and write several books, is not the kind of depression people suffer bad from. That's surely not a "lose job, ruin marriage, get alcoholic, stay isolated for months or years on end, attempt suicide several times" depression.
People with actual, serious issues have screwed a lot of people over.
Plus, from the article: "In 1987, when I was 31, I suffered a suicidal episode, which I fortunately lacked the courage to bring to its conclusion. I stood swaying on high buildings; I teetered on the edge of Tube platforms".
Please. Those "attemps" are a dime a dozen. Heck, most people think about it one time or another, including myself.
And I personally know several people who tried (far more than "teetering on the edge of the subway") to off themselves at various points. It's more common than you think. You don't even have to be that depressed. For some it was merely an attempt at attention grabbing.
People with actual, serious issues have screwed a lot of people over.