Why is the part about Sinclair news reporting on "Islamic terror" and "Trump support" singled out. Do they not report on anything else at all? Or is reporting on both this stuff by default a wrong thing to do?
Sinclair does not report on anything. Local TV stations do their own journalism, but Sinclair owns the station and can order the local broadcasters to read scripts.
Those topics are likely the only ones with concrete evidence.
Sinclair are a media company that owns local news stations. For the past few years, they've been feeding "must run" content (in the form of pre-recorded segments or scripts for anchors to read) to those news stations to be presented along side news.
Those segments are, overwhelmingly, right-wing talking points.
Those topics are likely the only ones with concrete evidence.