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The idea of "objective journalism" is both ahistorical and unsound and mostly just acts as cover for claiming that certain journalism has subjectivity we're not allowed to call out.
It's far better to know how the editors see the world than to falsely pretend that they don't.
At least editorials are honest about the views of the institution.
Similarly, an endorsement could in countless ways not simply be partisan. For example, based on what is most predicted to help the country with X/Y/Z.