This upcoming (? – the link is to the Wayback Machine) article in the Atlantic is about how Mark Milley made sure Trump was not able to subvert the 2020 election. Laudable I suppose, but heed this paragraph:

Milley and other military officers deserve praise for protecting democracy, but their actions should also cause deep unease. In the American system, it is the voters, the courts, and Congress that are meant to serve as checks on a president’s behavior, not the generals. Civilians provide direction, funding, and oversight; the military then follows lawful orders.

The Atlantic, via the Wayback Machine

It’s not hard to imagine an alternate scenario where Trump’s scheme to subvert the election succeeds, and the military announces it is temporarily suspending the Constitution to protect the Constitution. A general takes over as president in a “caretaker” role until such time as a free and fair election can be organized and held, and the Constitution restored. Maybe this could even work out, but if it happens one time it is likely to happen again, and the more times in happens the more of a joke the Constitution becomes. Tweaks could be made to the Constitution to stabilize whatever it was that we think caused it to become unstable, and over time we would deviate more and more from democracy and the rule of law, even if the military governors were benevolent. And of course, there is not guarantee there would be – you could get somebody bad emerge as a leader, factions could emerge, and things could get ugly.