To add, find the source itself; submissions to HN are sometimes guilty of this (and often get corrected), posting an article about an article instead of the article itself, the meta-article telling you how to feel and think about the source instead of the source sticking to the facts. And the headline on HN itself priming you as well (but there's the policy that titles on HN should not be editoralised).

It's why I like kinda "boring" news outlets like Reuters. I don't know for sure but our national news thing (NOS) feels fair as well, it doesn't have an overt political alignment and will often report on both sides - even if I'm very much inclined to dismiss one side, but I won't claim to be unbiased.