I don’t think he set it up. I think All of the Allies were headed by blithering political idiots at first.
Even the Axis nations could not believe how stupid France/UK was when it came to Poland, Czechoslovakia, Austria, Norway, the Ardennes and the Maginot Line not running all the way to the sea. Or even how Stalin destroyed his own army through purges and thought Hitler was trustworthy.
Let’s no even get started on The British and Singapore.
It is my belief that the only thing Roosevelt did not know about the Pearl Harbor attack was when it was coming.
History has taught us that a weak military invites attack.
We were weak at the time of the Pearl Harbor Attack, and we are weak now. And getting weaker every day.