I wouldn’t say we were Pacifist at all, not like “Hippy” Pacifist, Isolationists just thought it wasn’t our business.
But I guarantee if the Germans came after us, there would have been no Pacifism. Our industry would have ramped up on a dime, the Germans at best could have gained a beachhead or two, but they would have been eventually routed.
His generals would have made damn sure they would kill him, before attacking the US.
The US was totally unattainable for them at that time. They had no way of projecting their power this far.
Likewise, we had no way of projecting our power that far, WITHOUT bases in Europe, to stage our offenses.