In Tang Feiyang's view, this is how a demon should live:
When he looks back on his life, he should feel no regret over wasted years, nor shame over having achieved nothing. Then, at the moment of his death, he can say: I have devoted my entire life and every ounce of my strength to the most glorious cause in the world: taking down the whole world!
Ohohohoho, we're the bad guys!