He's just showing that those people don't give infinite value, not that it's nonsense. It's nonsense because, even if you consider life infinitely more intrinsically valuable than a green piece of paper, you'd still trade a life for green pieces of paper, so long as you could trade them back for more lives.
If life were of infinite value, trading a life for two new lives would be a meaningless operation - infinity times two is equal to infinity. Not unless by "life has infinite value" you actually mean "everything else is worthless".
Here's the new thread for posting quotes, with the usual rules: