Speaking as the granddaughter of one of those baaaad 1930s people...
You overreach yourself again.
My grandfather was a devotee of Father Coughlin. I don't think you could say he supported Hitler, though he certainly opposed getting into another European war. And why? Because he was a machine gunner in the AEF, during the First World War.
After that, he pulled his family through the Great Depression. Isolationist? Hell, yes!
None of his sons agreed with him. And no, he never did forgive FDR for my oldest uncle's death. But he never liked FDR to begin with.
He was a good Republican.
