Particularly after the whirlwind defeat of the effete French by the German Blitzkrieg in May-June 1940, it seemed obvious to most middle class people in the world that the fit 1As were bound to win , every time, over the unfit 4Fs.
Survival of the fit over the unfit : bigger is better/might is right : Q.E.D.
A Fact of Nature : the classic 'Appeal to Nature'.
But Dr Martin Henry Dawson strongly and fundamentally disagreed with this particular Appeal to Nature, or at the very least, he wished to make another and stronger scientific appeal to the Facts of Nature.
For he felt he had found another (and statistically much better) method for assuring long term survival, as revealed by his study of Nature.