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.
So what can we learn from the above? Essentially gross insubordination or the wilful refusal to follow a reasonable management instruction is gross misconduct. However, in order to justify dismissal an employer must first be fully confident that the instruction being issued is in fact a reasonable one. If it is not then the dismissal will be unfair.