As a quick reminder, the darklings wanted to by Jub's firstborn. People who buy other people tend to not be good people.
Oh absolutely. That is what Jub is leaning towards at the moment.
Now that I'm thinking more about it, if he were to try and stop Brutrumukk, it would have less to do with morals and more to do with "After nearly dying twice today (and Brutrumukk actually dying) can we afford to start fights with any more weird fey creatures, especially when we're missing a good chunk of our group?"
So yeah, less of a moral compass thing and actually more "Which one is going to cause us less problems?"