First digression: From what I understand (with a limited knowledge of the subject), the UK SAS is in fact one the top military groups on the planet if not the best.
My own delusion? That's hard to say. Probably on the lines that America (Hollywood as well as outside the studio system) makes the best movies overall in the world.
I use the term America and Americans in describing citizens of the US. That in itself is a labeling delusion considering there are other countries in North and South America that could use that moniker but seemingly choose not to.
I'm not sure it's a delusion (perhaps this hesitation actually indicates as such):
But I believe that Truman was correct to drop the first nuclear bomb on Hiroshima in WWII (but not the second nuclear bomb).