I think that you’re making assumptions that journalists aren’t as ethical as you are. The few I have known have been pretty serious about maintaining their journalistic integrity, and the fact that even some Fox News people have left demonstrates serious intent. I suppose what I’m criticizing in your thesis is your assumption that journalists as a group are morally inferior to you. Sure, I can see individual journalists being untruthful, but the whole community? I don’t think so.
This is a misunderstanding of Chomsky’s thesis. It’s not that journalists collectively are unethical or willfully dishonest. In fact, much of the filtering occurs during the hiring process. I.e, those journalists with views contrary to the interests of the owners of the media enterprise or their sponsors (advertisers) are overlooked or pushed out. Media propaganda is typically not overt acts of censorship or deception (although that does occur too). The issue is much more systemic.
Chomsky makes a similar point in a 1996 BBC interview here: https://www.youtube.com/watch?v=lLcpcytUnWU