You’re totally right, the US government and business elite were content to make money from both sides of the conflict right up until Dec 7, 1941 and the subsequent DoWs from Germany and Italy (once the US declared on Japan). They may have favored Britain and France in trade/indirect support somewhat before that, but that was more a result of historical diplomatic and economic ties, rather than any issue with the German political system.

The US government is not (and has never been) against fascism for ideological reasons. Fascism and American-style democracy go hand in hand quite well. Our government fought a war against fascists because they disrupted the global trade status quo and threatened US economic prosperity and that of our primary trade partners.