But that's IMPOSSIBLE because newspapers are RELIABLE SOURCES. Or so I'm told.
"Reliable" does not mean "right". It means "right often enough for it to be worth us trusting them". It's pretty much impossible to find a source you can be 100% sure is right (the only exception I can think of is a primary source for facts like "So-and-so claims such-and-such", and even then there is a chance the source is a fake). There is no way we can personally check every fact we mention, so we have to trust external sources to be correct. If they turn out not to be, we obviously need to correct the article, but other than that, there's nothing we can do.