I don't think I'll ever understand how everybody can generally agree that mainstream media is largely corporate owned, influences its reporting to maintain their power, wealth, and influence, and maintains the status quo, yet people arrive to the conclusion that mainstream media is biased against right wing conservatism.
Thought experiment: What would corporate media biased toward right wing conservatism look like? What would corporate media biased toward left wing progressivism look like? What do most corporate media outlets more closely resemble?
In general, they prioritize their profit above all else because their corporations in a capitalist economy. They only report as much truth and fact as required to maintain some amount of legitimacy and avoid fines and lawsuits; otherwise they do and say whatever it takes to maximize viewers, clicks, engagement, and advertisers. Sounds like their agenda is to make as much money as possible without risking turbulence which could cause swings in company valuation. Keep things as they were, nice and stable, while growing their own wealth and power? Sounds like right wing conservatism to me.