Negative psychology. The uibsans trial song is called Megalovania (The Arrogant Man). The lyrics can express Sans's ridicule towards the players who want to kill everyone. But from Sans, we know that the protagonist has the "determination" ability to turn back, and he stated positively that he could not defeat the players in the battle. Negative and Nihilistic Attitude The name of this BGM may also have a bit of sans self-deprecating attitude. It is not good to have such a negative mentality.