The reason is that a military defeat of Britain will bring about the disintegration of the British Empire. This would not be of any benefit to Germany.
“But if you really want to get involved in making a difference, you can stay at home with your family and have a job and make a reasonable living without having to be on an airplane all of the time, then you ought to go back home and run for School Board.”
“Theatre director: a person engaged by the management to conceal the fact that the players cannot act.”