As any other player, I only do my best with the information I have. Even without knowing anything about the Zuma internally, I don't think it should be any surprise if they are unpredictable or suddenly change their stance. Humans even do it, certainly beings that most likely see humans as inferior beings would care less about what they would think about such behavior.
To illustrate this point in a more relatable real-world analogue, let's take the Greek gods as an example. They were notorious for being whimsical and generally indifferent to the suffering of mortals. If Zeus wanted to impregnate some mortal woman, he did it. If you pissed off Athena in any way, she'd mess you up. Heck, she turned Arachne into a spider because Arachne claimed she could weave better than Athena, and backed it up. She turned Medusa into a Gorgon because she got raped by Poseidon. I think we can fill a big list of the unpredictable and seemingly unreasonable behavior of the gods.
Basically, if you were a mortal human living in Mythological Greece, your best bet to staying alive and human was not to piss off any gods, give them your sacrifices, praise, and worship, and hope for the best. I'm not saying that daimons are "gods", but they are powerful magical otherworldly beings that have claimed to be able to see the entire breadth of a human's life at a glance. It's also generally a good idea not to piss them off.
Now, for characters, I can understand how they might feel that the daimons are unreasonable. They might feel angry, betrayed, whatever, and that's natural. As well, characters can try to trick such beings, they can try to use them to their own ends, but that will probably not end well. The characters can feel whatever is normal for humans to feel. But, as players, we should keep in mind two things.
First, that this is still a game, and people can make mistakes. However, in this case, it probably wasn't one.
Second, that no matter what your character might feel, players should be aware that trying to apply human reasoning to clearly inhuman beings is incorrect. Maybe humans expect reasons for their actions, and would be up in arms if another human suddenly did something unexpected for seemingly no reason. The character can feel the same way in the case of inhumans doing things they can't understand, but please don't be angry OOCly for them. Complaining on the forum about it doesn't really help. If you, or anyone else, really feels so annoyed ICly, then try to do something in-game about it.