Pretty much everyone trusted the Media back then. They hadn't burned their bridges with psyop after psyop. For the 20% or so that dissented, they had the alien and sedition acts. The Dem FDR admin threw Japanese people in concentration camps simply for the crime of being Japanese.

After the war, people who spoke out against Communism got cancelled (McCarthy) or died in "accidents" (Patton).

The ensuing Hoax (Low Cost) propaganda push made them morally untouchable. Interesting coincidence how the Communist Russians were the only ones to find death camps. They'd never lie about this, their economic system was so liberating that they had to build walls to keep the slaves in.

Brother wars to kill off their main obstacle to world domination make total sense once you notice that their religion commands them to consider us as cattle in the context of moral decision making, and then lie about it.