Roseanne's core message–that love and family are more important than politics–threatens a lot of people who have built their entire worldview around the idea that anyone with different political opinions is stupid and hateful. It's harder to dehumanize "the other side" when you realize that they're complex human beings just like you and no less deserving of respect. That's why the media is melting down and doing everything they can to stop the success of this show.