... ust show me an example where they have done that...
Next time I come across it.
At this point, speaking for myself, but also in agreement with Alan, I can only recall years of fact-checking fact checkers and finding bias, ranging from subtle to outrageous.
Most fact checkers do a reasonable job in presenting the case (though some would omit inconvenient aspects already at this stage). But the real bias shows when they give the final verdict in one or two words (true/false, partially true/false, etc.). There are complex cases, where a single label can not possibly denote the complexity, and yet that is all that people see and remember.