Manhattan prosecutors submitted handwritten diary entries allegedly penned by Luigi Mangione in new court filings Wednesday, telling a judge, “If ever there were an open-and-shut case pointing to defendant’s guilt, this case is that case.”

Responding to efforts by Mangione to get his state terror case dismissed, Manhattan District Attorney Alvin Bragg’s office said the accused killer ‘s alleged writings make clear the fatal shooting of UnitedHealthcare CEO Brian Thompson was political and ideologically motivated.

“Defendant’s writings further show that he hoped the murder of another human being would trigger widespread action,” Assistant District Attorney Joel Seidemann wrote.

The filing quoted a line in Mangione’s alleged writings saying he wanted to whack “the CEO at the annual pa

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