My take on the situation is that as a movement and political ideology "Progressivism" is steeped in a sense of righteousness. I very much sense progressives have internalized the notion that what they are fighting for is so obviously good, correct, and just that anyone who opposes such self-evidently virtuous things must either be 1) brainwashed by malevolent forces (Fox news, misinformation, propaganda, internalized oppression) or 2) constitutionally flawed people who cannot be redeemed and must be fought against ("Deplorables", fascists, nazis, racists, etc).