Just because a writer’s words appear on a popular site, people seem to think they are sterling bastions of sacred information. They’re not. They’re human beings that may not even know as much about a topic as you do. Whatever they do know, they probably know from reading one or two other posts by another writer who learned about the topic from reading one or two other posts.
Bloggers informing bloggers all the way down.
You cannot be an authority on 20 different topics. You just can’t. But people are trying to convey that they are. And there’s often a perception that they are. And this horribly broken system works from the perspective of the pageview machine.