Subsections 178(1) and 178(2) list a series of criteria. I would apply the same criteria, but only once it has been shown that a person is incompetent or politically biased. In my opinion, those reasons alone would be enough to dismiss someone. In other words, it would be a judgment call.
The person could also be dismissed for something as obvious as leaving their position in the middle of an election campaign. It might be because that person left for a holiday and forgot to tell us about it, for instance.