Privacy

People's opinions are measurably linked to the opinions of their (perceived) peer group. Conservatives were not born evil, they become evil after hearing evil bullshit from everyone and everything around them. That's why "brainwashing" in the form of repeating the same lie over and over from various sources works so well in convincing people it's the truth. Ban it, punish the liars, and the influence is reduced significantly. Invest in better education for the general population, specifically around critical thinking and media literacy (ideally something based on dialectical/historical materialism, which seems to be the best philosophical framework for understanding social realities) & historical education about dangers of fascism and capitalism, and the society gets a good anti-fascist vaccine for a couple generations at least.