A rational mind would think this is Batman, the ultimate escape artist, nobody actually saw him die, we just finished a war spanning multiple universes, I saw 50 Supermen, some of the other heroes are claiming this war was also fought in the future, what if this isn't our Batman?
An irrational mind would think well here's a corpse and it must be our Bruce because it is wearing his suit, let's bury him and call it the day.