The idea of the Black Hole Black Star was simple.
Since the Dense Battle Star would eventually be annihilated by the Wandering Alliance, why not surrender to its embrace ahead of time and become a part of the Black Hole? In doing so, their Dense Civilization might still have a chance to turn defeat into victory.
And the ability of Dense Civilization to reach such a mad decision was mainly reliant on the long-term ideological indoctrination within Dense Civilization.
In the educational programs of Dense Civilization, Black Hole Black Stars are often mythologized, thereby establishing a blind worship and veneration among all the people.