@kershaw_alex America continues on even if D Day fails. There was no existential threat from Germany in 1944. Worse case is a retreat to GB and try again in 45-46, or just let the Russians handle it. The July 3/4 1863 victories of Gettysburg and Vicksburg are far more consequential.
@BenTheBaneDavis Getting repeatedly punched and kicked in the head will do that. How can anyone be surprised by this? Fighting for a living is not conducive to long term brain health. The evidence is everywhere.