The Demon God Reincarnated As The Trash Villain!?

"Trash villains," or third-grade villains, are those who always end up as stepping stones for the protagonists, no matter the genre of the novel. They invariably face betrayal due to their lack of talent or power to protect themselves. But what if the trash villain was a Demon God in his past life? "Oh! You're the successor of the god of the sword?" he said as he stabbed the protagonist's heart. "Too bad! I had killed 10,000 sword gods." "What! You're the reincarnation of the Immortal Emperor?" he said as he crushed another protagonist just with his aura. "But what is an immortal emperor in front of this deity?" "So, you are the child of the will of this world?" "Oops! I just destroyed this world by thinking." "You got a Villain System?" he said as he destroyed the villain system with a single finger. "Tch tch, I am the progenitor of demons and sins, and you thought a useless system could do anything to me?" This is the story of the Demon God, Asmodeus, who reincarnated as a trash villain. But why does it seem like everyone is trash except for him?