How could this film have been made in the MIDDLE of WW2?
Were the Americans continuing to make Hollywood studio films while any able bodied man in Europe was forcibly being conscripted to fight and die battling the terror of Nazism?
Is it morally acceptable to watch such a film these days knowing that it was produced for entertainment, while across the globe the blood of thousands was flowing?
Probably not...
The the same time they were making "Casablanca", which was started in the January following December 7th's Pearl Harbor attack, they were putting together the propaganda ( in the good sense ) films "Why We Fight" which are very interesting if you ever get the chance to watch them.
A lot of Americans did not want to enter the war, and FDR realized it was increasingly imperative that we did otherwise the Fascists would probably take over the world. Also, of course, it was good for America's standing in the world as it left us in good stead and with military dominance over the world.