Did you misunderstand? I was never for a return of the lost east German territories, nor for a return of the lost eastern Polish territories. That's a recipe for desaster.
the Yalta Treaty benefited more the US than it did Germany
Of course. Just like in WW1, the Americans were late to the party but managed to turn the outcome of both wars into their advantage. Europe became militarily insignificant on the world stage with only two powers left: the USA and the USSR. Wasn't the destruction of the British Empire one of America's primary geopolitical goals?
the Morgenthau Proposal would've successfully divyed up the remaining German territory
Some say, the Morgenthau Plan was set up and implemented to starve the German population to death.