Well in that very quote you acknowledge that if the orders given by a president conflict with the laws of the United States, then of course the military cannot carry them out. So what is the military supposed to do when President Long orders them to take military action against American citizens (ie: Reed and the syndicates before they commit treason in rising up to overthrow both Long and the United States Government). And then when Long's actions cause Reed as well as several states to rise up in rebellion, what is the military to do? Do they leave him in power?
Yes. Yes they should. Leave him in power, refusing to obey illegal orders.
The real threat to Reed from Long is always Long's paras, at least until the war starts.
And no military is ever "apolitical". The military is just as much a political force as states of the union are. This is why the original United States had no military whatsoever. The states did. Think about the First American Civil War. Was the military 100% loyal, unquestioning of the orders they received, and apolitical? Or did 60% percent of the officers up and join the Confederacy, as well as about half of the military divisions? In game, does the entire military stand behind MacArthur without question? Or do Smedley Butler and Patton go off and join the CSA or AUS along with a cadre of other officers and divisions?
Of course the military splits when MacArthur coups,
he destroyed the USA and ruined his own pretensions of legitimacy in the process. No military may be
completely apolitical because humans are fallible creatures by nature, but the US military was
supposed to be quietly
there, not involve itself in partisan matters, and act only as ordered to protect the country in accordance with its laws. MacArthur throws all that out. He destroys the very concept of civilian control over the military that's been enshrined in our legal system since the beginning. He spits on George Washington's grave for his own petty power grab.
The War of Southern Aggression, by the way? Those officers who joined the Confederacy were traitors. Robert E. Lee was nothing more than a petty traitor, no better than Benedict Arnold--in fact,
worse than Benedict Arnold since Benedict Arnold didn't fight for slavery. That's how taking an oath to a country works. When a bunch of the country secedes, you don't get to go with them. Is Smedley Butler a traitor to the USA? Oh yeah. His justification (and IMO a valid one) is that when he defects the USA as an idea is dead, and only the shambling husk of its name continues on, but he's still legally a traitor.
Then again, so was George Washington.