The book tells you to never trust a mind flayer. And if you're happen to work on a common goal together, the mind flayer will drop you as soon as you're no longer useful to them. The advice you get is to build strong relationships with your allies instead.
So, unless my character is somehow special, I would now treat my allies this way and discard them when I no longer need them, if I decide to become a mind flayer.
I think it's somewhat problematic to prejudge an individual based on a general and cursory observation of a species.
If you transform, the Narrator specifically says the Emperor is unique and you could be too.
(I personally know many humans who also discard friends who are no longer useful, by the way, so this behaviour is by no means particular to mindflayers).
