Another clue may come from the meaning of the name Zerubbabel: The name Zerubbabel consists of two parts. The second part of this name is obviously the same as the Hebrew word for Babel / Babylon. The origin of the first part is a bit of a mystery.
Insubordination is generally a punishable offense in hierarchical organizations which depend on people lower in the chain of command doing what they are expected to do.
But there is more to insubordination. Generally, the courts will accept termination for insubordination when the offense is serious -- for example, constantly countermanding direct instructions from supervisors, providing trade secrets to competitors, or denigrating the company in public forums: