I'm not disagreeing that cable news broadcasts a lot of propaganda, but you can't both claim that you're servicing "customer" segments based on calculus, and also claim that the news wire viewers into the same opinion.

If it's the latter you don't need the former, etc.

I can agree that shoddy news (a lot of it these days) do abuse viewers worst instincts and provide plausible coverage for it, but there is clearly something more going on for a sustainable amount of people to still support this.