Plenty of Democrats do refuse to recognize that high taxes can stifle the economy. No intelligent ones, though. If you want to argue that proves there are a surplus of dumb Democrats you won't get any argument from me.
FDR had no idea what to do about the Depression
No one had any idea back then and I don't think things have improved much.
Oh, Larry, Larry. There's more than a surplus of dumb Democrats, there is a veritable abundance of the stupid buggers.