Do you see how you're loading and manipulating your words to serve your biased purposes? If an "extremist" view is popular with the "mainstream", it's definitionally not an extremist view. And has it occurred to you that a Republican might consider AOC or Bernie Sanders or Ruth Bader Ginsberg a "dangerous extremist" while a Democrat might consider Trump or Bill Barr or Mitch McConnell an extremist? Is it really that hard to imagine how other people not aligned with you politically might think?