From the Northern viewpoint, yes. But from the Southern viewpoint, no. Their rebellion was motivated by their perceived need to protect their institution of slavery from what they saw as the threat of a Republican administration.
You’re late.
You speak as if the Southern legislatures were answering only to themselves instead of their represented populations. Those populations which, I might add, had nothing to gain or lose either way if slavery fell but had everything to gain or lose if the States lost their rights as soverign entities.
Men don’t fight and die for that which doesn’t concern them, so why did the average Southerner fight?