I disagree. Nobody, but nobody, is some kind of robot perfectly witnessing and reporting events in some kind of perfect language that perfectly conveys the whole truth and nothing but the truth (despite the typical HN cyborg-wannabee viewpoint - the locally over-represented kind of person who decides they have no biases). "Consider the source" is always an issue. Always.

It's unpopular to say it, and a lot of people don't like to be reminded that they don't live in a world of perfect information, but it's true.