Why was all that done? So that American moms would not refuse to send their sons overseas to fight someone else's war. Even after Pearl Harbor the government was concerned that there would not be sufficient public support for military action in Europe as well as against the Japanese -- in spite of the fact that our actions against the Japanese were pretty paltry compared to our actions against Italy/Germany until V-E Day.
stay safe.
skidmark
Public attitudes about military service and war were certainly much more aligned in the 1940's then they are now in the post-Vietnam era. In other arguments about Iraq, Afghanistan, AWOT in general, I've pointed out myself how the public's attitude about World War II was not nearly in lockstep as it seems in hindsignt. 1940's newspaper editorials complaining about mismanagment of the European occupation after VE day could be used almost word for word for Iraq if you simply changed a few proper names of cities, peoples, and nations.
I suppose the War Department knew that the treatment of American POW's under the Russians would not be any better than it was under the Germans or the Japanese, and they may have had to engage in a whole second wave of conscription. The fear amongst the Executive branch and the Command staff that they had just fought for Europe for the past four years, to only lose it to the Russians, due to flagging American will must have been galling.
Protracted warfare is the one weakness that democratic/capitalist states have against totalitarian command nations. For the totalitarian state, they can just order their people into battle at gunpoint. Otherwise it's a strategic/tactical, manpower, and resources question. (Although the totalitarian states have their drawbacks. Stalin's paranoid purges cutting into Soviet manpower, Hitler's megalomania, the inneficiencies of production in command economies etc...)
For the "free" society, it requires the willingness of the population to serve. Granted there's the UCMJ, and various war powers acts that can sanction the population, put them under arrest, in prision, or even be executed for desertion in extreme circumstances. But the ability to force it's population into war without their cooperation is still very limited in comparison.
Ahh, that should have been obvious. Makes perfect sense.