Excellent point. The only one that didn't turn on him was the housekeeper. The big lesson from this movie is just how easily an event outside one's control can ruin their life. If a very unlikely event happens (or more than one), you're done (homelessness, severe injury, death). All the innocent people that have been incarcerated for life or for decades can identify with this film. There is always a large supply of morons available to apathetically discard the improbable.
On a lighter note, I used to think that Commodore character (William Windom) in the Doomsday Machine episode of Star Trek (Season 2, Episode 6) was Peppard, when I was a kid. But, of course it's not - it's a vastly inferior prototype.