If the U. S. were Austria, Rudolf Guilliani, John McCain, Donald Trump and George W. Bush would be fined for denouncing Pat Buchanan's view that Nazi Germany did not represent a threat to the United States during the 1940s. But, this is the United States.
Politicians can criticize fellow politicians.
Political scientists are allowed academic freedom. Newspapers publish citizens' opinions. Of course, such opinions need reasonable foundations. Making major politicians happy, however, is not one of them. In Austria, things are moving in a different direction.