The news producers were lazy, too. They'd literally take the script that ENPS pushes out, tweak a few words, and put it on air. I was working in a minor midwestern market (Toledo, Ohio). If you watched the evening broadcasts in the same market and nationally, you'd frequently see the same stories and similar verbiage popping up.
Being surprised by a broadcast group like Sinclair was forcing a narrative is like being surprised that the sky is blue. The "news" is highly filtered and easily controlled. To think otherwise is deliberate ignorance.
The broadcasting industry is corrupt and untrustworthy as all hell. My father worked in it at a high level (owning licenses and stations) and he'd frequently come home from trips either stone faced or frustrated beyond belief: https://www.nytimes.com/2011/04/22/business/media/22spectrum... (he's the stately looking black fella throwing a fit in this piece).
To trust anything the mass media tells you is to severely handicap your intelligence. Unfortunately, large swats of the general public do exactly that.
/rant