I've got to disagree on differences of opinion being manufactured. The differences are part of human nature, like you and me right now. Most of the hot button issues today (aside from gun violence) have been around since the dawn of civilization.
I do agree that the 24 hour news cycle and tv news in general is toxic and too negative. You're local news is basically a summary of deaths, catastrophies, and crimes with one feel good story sprinkled in. I don't think it's some conspiracy to control the people though. I think it's much simpler than that. It's just money. The producers and executives know what sells, and they need those eyeballs to make money. You can look no further than ESPN to validate this. Sportscenter isn't sports news anymore, it's sports drama. I think the general public is hurting themselves by not demanding better. They don't want to think they just want to feel and have those feelings validated. If tomorrow we all tuned out until we got real fact based programming without the drama you would see the change, but we know that will never happen.