How Can Someone Who Uses Zombies to Cultivate Immortality Be Called an Evil Cultivator?

Traveling through the apocalypse, zombies are rampant, and supernatural powers are awakened? Lin Yuan just wanted to sneer. In this hell on earth, what he cultivates is the devil's way! The zombies are the materials, the crystal cores are the spiritual stones, and the human fortress is the best blood sacrifice dojo! As a savior? No. He wants to prove his Tao through killing in this wasteland and become a demon immediately!