Maybe you're giving it a pass because it's a quick to read comment. If this is an essay or a book, I'm absolutely going to consider skipping it at the first major error. This is especially the case if the book is heavy on building a case which would need to be backed by facts (sources.) If the author isn't willing to include sources to back up claims which are passed as fact, then I'm not going to do the work myself. It's difficult enough to open the time to read the thing in the first place. And I would be doing myself a disfavor by believing any of it.