Yeah, that's the thing about voting; people can use it for things that you dislike such as "giving the finger to the rest of America" and you still need to honor the results. There would not be another civil war if another seccession vote happened and whether you consider it short sighted or not doesn't matter.
What part of the Constitution or the law allows for such a vote?
After the secession, what's next? Ethnic cleansing? or just re-education camps?