Either you fell into establishment propaganda or peddler of it. Any system will develop extremists no matter what, if the establishment are too corrupt, and people are pushed to look for alternatives. Canadian PM Trudeau scrapped his first-term election promise of ranked choice voting after “looking into Europe” and said the same thing as you; and yet the Canadians have developed their own far-right lunatics over the years. And US has the Republican Party morphing already into another fascist party, all without copying any sort of multiple choice voting system from others or developing their own.