Law 42 of 48 laws of power by Robert Greene says- strike the shepherd and the sheep will scatter. It is often seen that one person ruins an environment, that one person for one reason or other neither lives in peace, goodwill or lets others live. He says that the minute you identify that person banish him or her from that circle, place. Cant say it is a bad idea! Because if you let these people linger they cause irreparable damages before being kicked out.