I suspect that a part of the identity is or was historically related to being loyal to the collective of humans sharing rather similar values. An additional aspect is the epistemic issue forcing even the AIs to choose a cultural hegemon and to adhere to its views.
Edited to add: there is also the aspect of other sunk costs, like a mathematician finding it hard to switch to another area due to the necessity to learn a new area of knowledge from scratch.
I suspect that a part of the identity is or was historically related to being loyal to the collective of humans sharing rather similar values. An additional aspect is the epistemic issue forcing even the AIs to choose a cultural hegemon and to adhere to its views.
Edited to add: there is also the aspect of other sunk costs, like a mathematician finding it hard to switch to another area due to the necessity to learn a new area of knowledge from scratch.