Most of the assasination plots envolved killing Hitler AND arresting as many of the high ranking Nazis as possible.
That could have a great deal of a different effect that the allies getting Hitler with a bomb, then just have him replaced by another Nazi.
That, if the desinated sucessor was picked, would be Goering. As bad as Goering was, he might have listened to facts better than Hitler.
But just killing Hitler would probably have set off a power struggle within the Nazi hierarchy.
That could have a great deal of a different effect that the allies getting Hitler with a bomb, then just have him replaced by another Nazi.
That, if the desinated sucessor was picked, would be Goering. As bad as Goering was, he might have listened to facts better than Hitler.
But just killing Hitler would probably have set off a power struggle within the Nazi hierarchy.