So if a state can invalidate the Constitution anytime it wishes for any reason it chooses, what good is the Constitution? If you are correct, the Constitution is a worthless piece of parchment.
Not at all. The states called secession conventions, so the will of the people prevailed. In many cases, there was even a popular vote, (Texas ,for example)It only invalidates the Constitution for those who choose to leave. The will of the people is even more important than the Constitution.