Massie did nothing wrong. If you want to learn about how a President overthrew the Constitution to keep the Union whole in a genuine, yes-hundreds-of-thousands-were-killed existential crisis, go read up on Abraham Lincoln and the Civil War.
I know all about the civil war and the endless arguments regarding it, good Lord, there have been enough endless threads about it over the years right her on FR to dredge every nook and cranny of those arguments.
In an existential crisis - and yes like the civil war this is that, you don’t put your economy purposely into cardiac arrest over something less, you don’t do that just and only to keep us geezers alive - the Constitution provides very limited guidance. In the real world that everyone is living in today, you probably couldn’t trade it for a roll of toilet paper. Maybe one day, when normalcy returns, it can again take its place as an agreement under which the people - all the people - agree to organize their affairs. But for today, people are trying to survive, with limited means at their disposal to do so.