Of course, people always believe other people's moderate proposals are dangerous extremism.
For instance, the FBI considered Martin Luther King Jr a dangerous extreme leftist to be spied-upon for the sake of national security, and of course, part of the reason MLKJr was actually a socialist was precisely because mid-century America's idea of "moderate" and "normal" was that prosperity for the white working-class could and should be purchased with the tortuous exploitation of the black and immigrant working classes, and that anyone who would run a Poor People's Campaign for all colors together was a dangerous extremist who had to die.