It is precisely this behavior, unconcerned with guardrails or rules, unmindful of cause and effect, all according to his momentary whim — an overwhelming, almost anarchic instinct to try to invert reality — that prosecutors and much of the political establishment seem to most want to hold him accountable for. The chaos he creates is his crime; there is, however, no statute against upsetting the dependable order. Breaking the rules — often seemingly to no further purpose than just to break the rules as if he were a supreme nihilist or simply an obstreperous child — is not much of a grand criminal enterprise, even though for many, it’s infuriating coming from someone charged with upholding the rules.

Many Democrats have come to assume that the dastardly effect of Mr. Trump’s political success must mean that he has an evil purpose. During his trials, prosecutors will try to establish that precise link. But that might not be such a trivial challenge. He is being pursued under several broad, ill-defined statutes like the Espionage Act, RICO, conspiracy and obstruction of justice. Without an exchange of money or quid pro quo, proving his crimes will largely come down to showing specific intent or capturing his state of mind — and with Donald Trump, that’s quite a trip down the rabbit hole.

His prosecutors will try to use his words against him: among them, his exhortations that arguably prompted the Jan. 6 attack on the Capitol, his admission — on tape! — that he still had classified documents, his various, half-baked plots about how to game the Electoral College system, his relentless and unremitting insistence that he won his lost election and his comments to his bag man, Michael Cohen, before he paid off Stormy Daniels.

For Democrats, it’s an explosion of smoking guns.

And yet the larger pattern, clear to anyone who has had firsthand experience with the former president, is that he will say almost anything that pops into his head at any given moment, often making a statement so confusing in its logic that to maintain one’s own mental balance, it’s necessary to dismiss its seriousness on the spot or to pretend you never heard it.

Jack Smith, Fani Willis and Alvin Bragg will try to prove that the former president’s words are nefarious rather than spontaneous, that there has been a calculated effort to deceive rather than just idle talk, a series of crowd-pleasing gestures or cuckoo formulations and that his efforts to obstruct the investigations against him were part of a larger plan rather than just the actions of a bad boy. I’d guess that the Trump opposition doesn’t much care which it is — nefarious or spontaneous — but are only grateful that Mr. Trump, in his startling transparence, has foolishly hoisted himself by his own petard.