A line from the TV series "The Ming Dynasty 1566": Don't use it because the Yellow River is turbid, and don't use it because the Yangtze River is clear. This sentence should be said by Emperor Jiajing of the Ming Dynasty

It is used together with honest and corrupt officials, and with loyal and treacherous ministers.

Bad people are not useless. There are some things that good people cannot do, but bad people can do them easily. Everyone has value. The key is whether you can employ people. If you use bad people to treat bad people, you will be able to use it, but if you are controlled by bad people, you will not be able to use it. Qin II doesn’t know how to employ people!