You've always needed to do this. The internet just drives that point home hard. Because when I was growing up 50 years ago, I just assumed that all the good things said about Christopher Columbus (to pick an easy example) must have been true because they wouldn't print it in a book if it weren't, right?
Years later, thanks to that same lie-spewing internet Discovery Magazine warns me about, I find out that Columbus guy was a real prick. That, and an idiot who thought he was the first to cook up this "round Earth" theory (only to be beaten by 2000 years by, eh, the Greeks was it?), and got it massively wrong at that.
The article overall, though, is surprisingly even-handed, lacking in ridiculous hyperbole so rife in such articles, and amazingly spot on.