He could ranted all he want because there would be no invasion the germans didnt invade Britain you think they would have the power to invade a super power like USA miles and miles from their home country?
Short answer...
NOOOOO.
Yes allies would "beat the nazis" (love the cliché vocabulary) but probaly most of europe would be communist occupied by Soviets I guess we didnt want that do we? But since a lot of people find them liberators and heroes or at least better than those "damm nazis" it would be for greater good.