Presidents are Commanders-In-Chief of the military. It would be very unlikely to see a former POTUS charged for something like ordering air strikes.
Hatching a multi-state scheme to illegally toss tens of thousands of Americans’ votes, on the other hand, is nowhere near arguable as an official duty. Ditto for falsifying business records to influence an election, stealing boxes and boxes of documents, and so on.
This entire “Trump won’t bow to the Deep State/Elites/Weaponized Whomever” is a myth. It is a coping mechanism for people who can’t bear to face the truth, which is that Trump stands apart from his peers in his sheer corruption and criminality.