This page in a nutshell: Any material added to Wikipedia must have been published previously by a reliable source. Editors may not add content solely because they believe it is true, nor delete content they believe to be untrue, unless they have verified beforehand with a reliable source.
Verifiability is as important as truth.
But reliable sources are biased!
From WP:BIASED (Wikipedia:Reliable sources#Biased or opinionated sources).
Wikipedia articles are required to present a neutral point of view. However, reliable sources are not required to be neutral, unbiased, or objective. Sometimes non-neutral sources are the best possible sources for supporting information about the different viewpoints held on a subject.
(Bolding mine)
But reliable sources are chosen by biased contributors!
OP attached to their comic repost RSP columns.
- Deutsche Welle: Reliability was never discussed in an RFC. Anyone complaining here of bias does not acknowledge their possibility (if they are not banned) of making an RFC on it.
- Voice of America: Discussed on RSN a few times. The last one is pretty interesting: Here
- Xinhua: Discussed here. ITT: It's quite old, but Xinhua is very controversial.
- Telesur: Discussed here around seven years ago. Quite conclusive, I would say.
