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.
Now one might explain away the insubordination as standard trash talk among stressed-out warriors. From day one, the press will be searching for signs of acrimony or insubordination. Inspections, harsh penalties for misconduct, and consequences for insubordination were the norm.