The PA may want a deal for a quick trial. The publicity of a long and drawn out trial won’t look good for all the rich, corrupt, assholes in power. They’ll want it to be over quickly and get Luigi shoved out of the lime light. Also, especially without a plea there is a very real chance that one of the jurors could vote “not guilty”, which would shine a huge spotlight on the fact that jurors can simply vote “not guilty” if they support whatever a defendant has done and they’d get off completely free, which again, the rich and powerful would dreadfully hate.

So I could see a lot of reasons that a prosecutor would strike a very good plea bargain with Luigi. The risk of an acquittal or long trial that could fuel copycat killings or a huge power shift in the US seems pretty realistic.