No, they know what they are doing and you can tell they know what they are doing by the careful way language is used differently for similar facts when the police or other favored entities are involved vs. other entities in similar factual circumstances (particularly, the use of constructions which separates responsibility for an adverse result from the actor, which is overwhelmingly used in US media when police are the actors—and also, when organs of the Israeli state are—but not for most other violent actors.) This is frequently described as “the exonerative mood” (or, sometimes, “the exonerative tense”, though it is not really a verb tense.)
Carefully calibrated, highly-selective use of (often, quite awkward) linguistic constructs does not happen unconsciously, it is a deliberate, knowing choice.