I don't believe Vonnegut beleived that for a minute.
> Hello babies. Welcome to Earth. It's hot in the summer and cold in the winter. It's round and wet and crowded. On the outside, babies, you've got a hundred years here. There's only one rule that I know of, babies-"God damn it, you've got to be kind."
Hunter gatherer societies we like to imagine as constantly being on the edge of starvation, but in reality during summer months, they could hunt and forage a whole day's worth of food in a few hours, and then spend the rest of the time farting around.
> Hello babies. Welcome to Earth. It's hot in the summer and cold in the winter. It's round and wet and crowded. On the outside, babies, you've got a hundred years here. There's only one rule that I know of, babies-"God damn it, you've got to be kind."