Personally I find the Illithids to be of a more understandable kind of evil. I mean their tadpole infestation is their means of reproduction. Their actions (especially their experiments on different races) has a purpose (betterment of their gene-pool and guaranteed reproduction). It is still evil, but not pointless. Don't misunderstand me. I mot making the Kagha argument about a viper defending her nest, because the Illithids are intelligent enough to modify their methodology. They just seeminlgy never developed any kind of moral framework to let this even be a consideration.

However, the Githyanki on the other hand seem to be assholes just for the sake of it. Their attitudes seem pointless to me and more a result of a historical race wide trauma maintained through rituals, believes and stories. Their claims of superiority are just comical and Lae'zel exemplifies that perfectly. She enjoys using others and making them grovel. It may even stand in the way of achieving her goals.
Like the meeting with Githyanki patrol: All of the Gith are just so hostile towards each other without any reason... It is just pathetic in my eyes and results in slaughter and blood.

I hope the Githyanki will become more interesting than that deeper into the story.