Douluo: Becoming a Villain Starting from Emperor Xingluo

After reading a few chapters, I was a little confused, why did I want to kill Tang San? The goal of the Wuhun Empire is to unify the continent, and Tang San destroyed the Wuhun Palace, so that there are still two empires on the mainland. Logically speaking, Tang San's existence is profitable for the protagonist Also, Dai Mubai's final outcome is to become a god, and Emperor Xingluo only has two sons, doesn't the throne belong to the protagonist?

The protagonist kills his brother from the beginning, and he doesn't have the confidence to be able to suppress his brother even when he grows up?

The King's Realm directly leapfrogged the level to regain Contra, which had martial soul fusion skills comparable to Titled Douluo. It's really exaggerated. If you act like this, you can directly subdue Tang San and others, or everyone else besides them, and you won't be directly invincible.