"...in European tradition, the Poles are stereotyped as the fools." Not in European tradition, so far as I know. Perhaps in Germany (I guess at random), but that'd be a localised matter.

In England anyway, the stereotype of Poles is more of being romantic, recklessly brave and intellectual - an amalgum of Chopin, and of fighter Pilots and Polish Cavalry charging tanks in the war. No more accurate than any other sterotype, but different from the one Americans seem to have.