As others pointed out, so no need to repeat, Einstein was not a citizen of Germany during WW2.

However, I daresay that he supported his country of birth during the war. Very much so.

You see, country and regime are not the same thing. Despotic regimes love confusing the two concepts, to make you believe that it is your patriotic duty as a good citizen to support a regime even if it becomes a regime of wholesale murder and destruction.

But true patriots are not fooled by despots and their “patriotic” propaganda. And any true German patriot who believed in the fundamental goodness of Germany as a country and the decency of the German people would have opposed the murderous National Socialist regime of Adolf Hitler with every means available. As indeed there were many Germans who did so, often risking their own lives in the process.

Einstein, living in the United States at the time (in fact, he became a US citizen in 1940) did not have to risk life and limb, but by lending his credibility in support of Szilard’s infamous letter to Roosevelt, and thus contributing to the launch of the Manhattan project, Einstein supported the cause of humanity against one of the vilest regimes in human history; and by implication, he supported Germany and the German people against the despot who ruled them.