> What makes people go from believing the media, science, etc to unwarranted skepticism?
It's the phenomenon of illusory truth. Wiki has some sources [0][1][2]. It seems inherent to discussions on the Internet as it becomes more and more accessible and popular. The only obvious way out seems to be educating people, but not enough entities seem interested in doing so right now. Maybe pessimistically, I don't think people en masse can learn on their own about the dangers of misinformation unless crises occur that directly impact their lives.