The truth doesn’t have an agenda
Instead we have appeals to 'truthiness' and 'fact-check' that defy the basic premises of human nature.
Partisan 'fact-check' outlets are a good example of this.
An admission of bias would serve as a disclaimer and a reminder for the consumer of news. Integrating the disclaimer into the writing could actively influence how the article is written.
I imagine they know they don't like the guy, but in their minds it is justified. I suspect there's a fair proportion of their staff who believes enacting Godwin's law isn't hyperbole.
For them, selectively misquoting the Charlottesville press conference isn't misleading, because they believe that they know the _truth_ about his intentions.
More or less, but the belief may be strong enough that they don't view it as misinformation. If they already believe Trump is a racist, selectively quoting his press conference in a way that construes him as a racist is accurate in their eyes. The full quote where he criticizes the racist groups could be viewed as Trump lying or hiding his true intentions, so they may feel it is their duty to not report that.
Of course journalists are individuals and there's a spectrum of this behavior on both sides of the aisle, but this is my take. Willful ignorance isn't only for children or idiots. Let's also observe the volume of illogical and often emotional arguments presented.