I talk about the bodhisattva ideal of compassion in the article below. There are political reasons why Buddhists wouldn't want to upset the unnenlightened with the cosmic truth, and by pretending that someone with no ego and thus no capacity for suffering would nevertheless have saintly compassion for all beings. Leo Strauss explains the double truth doctrine that serves the political purpose of not arousing unenlightened people's anger with the religion or philosophy.

https://medium.com/gods-funeral/cosmic-neutrality-and-the-paradox-of-the-bodhisattvas-virtue-b4b537cd4567?sk=39072a824112429211571a9a597abef5