While it was morally and constitutionally wrong for the insurrection to have occurred in the first place, its failure was a good thing and the efforts to put it down were righteous indeed.
Not Constitutionally wrong, the SCOTUS had ruled that the Sates had the right to voluntarily leave the Union. By the way, that ruling has never been legally overturned.
What clause of the Constitution dictates the voluntary entry into the agreement as being a one way street?
Recall that though slavery was morally wrong, it was Constitutionally permitted.
You cannot argue the Constitution both ways.
“While it was morally and constitutionally wrong for the insurrection to have occurred in the first place, its failure was a good thing and the efforts to put it down were righteous indeed.”
How will you feel when it happens again for reasons of gross Constitutional abuse and Liberty deprivation from a tyrannical Government? It won’t be another revolution because there will be significant numbers of people who would live with the new rule.