That was one of the reasons the Allies did't want to assassinate Hitler, he did more damage to the German war effort than the Allies and Soviets ever did. He was too busy ordering weapons and machines that was useless and/or never going to change the tide of the war, even if it had been developed at the start of the war.
I've always found that claim dubious, primarily because I've never been able to find a decent source for the it.
“Close” only counts with horseshoes, hand grenades, and tactical nuclear weapons.
That which does not kill me has made a grave tactical error
Source Materiel is always welcome.