

Take the sentence “Police accused John Doe of inciting a lynch mob to attack the alleged rapist“. The police aren’t alleging that the victim was a rapist, they’re saying the rape allegation was part of the context of their own accusation against John Doe.
If an act is described as an accusation, it’s already implied that everything within the description is an allegation by the accusers. But if something within the description is itself labeled as “alleged”, that nested allegation becomes part of scenario the accusers are reconstructing.
The same journalist wrote a piece last summer titled “The seeds of this political disaster were sown decades ago”. I can’t read it due to the paywall, but judging from the title, they may not have been completely complacent.