I have no idea what motivated Bernadotte on 14 October. However, his character flaws definitely contributed to it as far as I can ascertain. Perhaps because he just didn't like Davout was reason enough for him.

Whatever the cause, Bernadotte's actions on 14 October, or a lack of action indeed, were dishonorable and not the actions of what a commander is expected to do, especially in the Grande Armee. Bernadotte wasn't stupid, and his actions can only be classed as deliberate.

Sincerely,
K