I don't think that is the case with the Cabal, you could say that they are similar to the Awoken when it comes to their views on the light and darkness. It could be that conquest is a strong part of their cultural identity and they wish to bring all sentient life under the rule of their species to prove their dominance. The light is just a means for them and I am sure if they had the option they would do the same with the darkness.
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And you are probably right, although the darkness would be the one showing their dominance over them lol