WASHINGTON — Six weeks before UnitedHealthcare CEO Brian Thompson was gunned down outside a Manhattan hotel in December, suspect Luigi Mangione mused about rebelling against “the deadly, greed fueled health insurance cartel” and said killing the executive “conveys a greedy bastard that had it coming,” prosecutors revealed Wednesday.

The Manhattan district attorney’s office quoted extensively from Mangione’s handwritten diary — highlighting his desire to kill an insurance honcho and praise for Ted Kaczynski, the Unabomber — as they fight to uphold his state murder charges. They also cited a confession they say he penned “To the feds,” in which he wrote that “it had to be done.”

Mangione’s lawyers want the state case thrown out, arguing in court papers that those charges and a paralle

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