Thread:TheHumanAmbassador/@comment-30937172-20181028162351/@comment-30937172-20181028200746

The monster on the glyph killed humans because they hurt a friend of his. He became a god, but it didn't last long. Asgore absorbed the human SOULS to protect his people, and Asriel absorbed Chara's SOUL only to die by not fighting.

All of those events happened whenever a monster showed compassion towards humans, but was never accepted and was seen as a enemy, just because they stood up for their friends and loved ones.