>Why blame him for fighting for the loosing side or the (undisputed) crimes of war done by others outside his sphere of influence?

The answer is pretty simple.
His side lost the war.
If his side had won, you and I might be arguing about whether one of my favorite golf courses on Long Island should be named Eisenhower Park - or should be re-named Von Runstedt Park- we'd be arguing in German, of course.