What makes it lunacy is that it has been tried before and it is clear that the US would respond with OVERWHELMING FORCE to ensure the Union does not break apart.
What makes it lunacy is that in today's society, Texas included, there is not one predominant ideology but many, each with its own interest based on race, religion, or economic status. Once the break away process begins, each faction is going to try their damnedest to come out on top. It will not be some glorious revolution, it will be bloody and a lot of people are going to die just because some people continuously look at the situation with romantic notions and not with the reality of what such actions will bring.