I think it's "VGhlIFRocmVlLUJvZHkgUHJvYmxlbQ==" The aliens cannot lie to each other (they don't even have the idea of a lie), because their thoughts are transparent to each other.

Sounds like a recipe for conflict.

It would certainly be a very violent shift towards a very different societal equilibrium.

Few, if any, people who currently have power, would be able to absorb the sheer amount of hitherto hidden distrust or resentment that their subordinates harbor towards them.

Interestingly, there might be two very different end stages.

Either a very open society where people at the top are selected to be non-narcissist and stoic, or a very closed and oppressive society where the absolute ruler is kept in power by a bunch of truly zombified and obedient warriors whose loyalty is real and unshakeable, and who will kill anyone whose brain entertains any rebel ideas too much.