I’m asking you a moral question, void of the context of the Civil War.
If the the US government abolished the Constitution (even if corrupt courts ruled that as “legal”) and adopts another form of rule which causes an even split in society bewteen those who want to retain/rule under the current constitution and those who choose a tyrannical but seemingly more secure form of government, would you consider insurrection to preserve the old Constitution?
Don’t dance around, answer the question as it’s written.
It cannot do so.
Its powers derive from the Constitution.
The Constitution cannot be abolished absent a Constitutional Convention.