No, in fact history shows that we did nothing to stop the killing of Jews. Why do you assume it's only about Jews? Why do Ron Paul and his followers hate Jews so much?
Regardless of how you try to dress it up, Ron Paul says he's just fine with Nazi rule over all of Europe and Asia. He's a complete goddamn idiot as are his acolytes. There's no excuse for his stupidity or this evil notion of letting Nazis butcher whoever they like b/c George Washington (in the 18th Century) felt it wasn't a good idea to get involved with other nations' disputes. Ron Paul needs to study the quote "The Constitution is not a suicide pact" very, very carefully.
I can't even get started on how stupid his idea is that if we just leave Muslims alone that they'd leave us alone. That is beyond stupid, well into suicidal. Whether our prior foreign policy caused the current animosity or not is irrelevant. The REALITY is that Muslims want us all dead or converted. Ron Paul's head would be on the chopping block as fast anyone else's, so I don't know why he pursues this idiocy.
And why do we care about Israel? Because if God is with them, it would be in our best interest to be with them, too. If you don't believe that, then we're speaking Russian to each other, anyway.
Did not the Bible say that you are blessed if you blessed Israel?