Why are the four famous criminals ruthless?

Ruthless father Sheng Dingtian, formerly known as Cheng Tingtian, lived in Beijing under an alias of avoiding enmity. Ben was a general. He was one of the two ministers killed by Cai Jing.

P.S. 13 The sect destroyed by the killer, or a noble family, was once a court official or had close ties with the royal family. Some people are dissatisfied with their treachery or their ambitions can't be displayed, so they join the Wulin. Some loyal Wulin people will do their best to help the royal family in case of an accident.

It was destroyed to eliminate the hidden trouble of interference.