VK,
That is comparing apples and oranges. WWII and the Allied invasion of Normandy was not a unilateral landing by the US. It was a combined invasion by the Allied forces against a joint enemy.

Yes, it was a risky venture by the Allies and a terrible thing to lose so many lives but it worked out for the best and broke the back of Germany and Italy. We cannot compare the storming of the beaches at Normandy to anything in today's world.