That's not entirely true. Generals might think that they are a better leader, and might go for the kill. Orks will problably betray you because they want a good fight and so on. Skaven might think that their leader is weak, and want to replace them.
Just because the Empire has their kind of propaganda, doesn't mean that everyone would gladly sacrifice their lives for the Emperor.
There are plenty of reasons to WHY a general should betray their leader. Chaos might be an option when your troops are stationed in their territory, but they would no less be rebels, because Chaos isn't united, more like divided. There are plenty of Chaos cults through out the land, and they are FAR from friends.

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