Suppose in 2011, a state or some states decided to secede from the union, over some real or perceived difference of opinion with the PTB on the federal level. They form their own country. The federal government can crush the secession, but at the cost of thousands and thousands of dead people. Is it moraly justified?
On the one hand, thousands of dead people and massive suffering. On the other hand, what? So these guys won’t be part of the same country as the other states. Big deal.
As backdrop, the US Civil War resulted in over 600K deaths, and other ruined lives of all sorts. Was it worth it?
Of course there’sa backdrop of ending slavery. Maybe ending slavery is worth 600K deaths but other issues are not. Or maybe that wasn’t worth it either.
[My main objective is not the Civil War here - it’s about a civil war over lesser issues, such as those we face today.]