Nobody ignores them. Sane people rely on them for info, and RWNJs watch them for something to whine about.
Information is supposed to be ACCURATE. If it isn't ACCURATE, people ignore the messenger because the messenger isn't ACCURATE. Just remember "The Boy Who Cried Wolf", it's a very, very old tale, and one that the progressives have either forgotten, or ignored.
So? All news organizations make mistakes, regardless if they lean left, right, or centered. The legit ones offer corrections and/or retractions. I can show you where Fox News did so just the other day regarding the woman claiming Roy Moore attacked her when she was 16. I can also show you where gatewaypundit made a mistake, but being the rag they are, offered no retraction or correction. They just scrubbed the the article from their website with no admission of error.