> Maybe everyone exposed to something should be re-exposed to the theme once there's a new development.

This doesn't work. Show people two articles, one that is false and one that is true, and most people will say the one that aligns with their priors is true. We need to either teach people to recognize fake news, censor fake news, or accept that basically everyone will believe false propaganda. There are no other options. Once someone has been shown an article they agree with telling them the article was false just leads them to think you're on "the other side".