Yes the source is very very important. A lot of people here decide not to read an article if it is not from a source they already feel pretty sure they’ll agree with.
OTOH most people don't take a bit of notice and take as absolute truth reports from less than totally unreliable sources.
Well, actually, I use it to ignore articles from WND, NewsMax, and a few others. I also use it to identify blog pimping.
A great way to keep from wasting my time.