During the programme, one of the guests mentions Karl Pearson an early 20th century social Darwinist and "Professor of Eugenics" . Pearson praised war as the engine of racial fitness and national progress. If not for war, it was said in Pearson's time, "the weak shall inherit the earth" .
These memes are with us still, though in the west they are rarely explicit.
 Those of us who did med school stats may remember the "Pearson distribution". Same guy.
 It's not clear from the discussion if the phrase came from Pearson, but I suspect it was a common usage of the time. Not for the first time I wish there were more IOT transcripts. The "After Our Time" wiki has @50 IOT transcripts, but the blog and wiki was only active for a few months in 2007. Among those few transcripts, incidentally, are early programmes that have been lost, including one featuring Stephen Jay Gould.
Update Feb 17, 2010: The Lost Episodes are now online.