Sahih Al Bukhari – Book of Oppressions

Volume 003, Book 043, Hadith Number 624.
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Narrated By Anas : Allah’s Apostle said, “Help your brother, whether he is an oppressor or he is an oppressed one. People asked, “O Allah’s Apostle! It is all right to help him if he is oppressed, but how should we help him if he is an oppressor?” The Prophet said, “By preventing him from oppressing others.”

Instead of helping the oppressors we do things other way around. we start doing his back biting and sometimes praising which doesnt help at all, instead spreads hate and cruelty in the society… when we see some person doing wrong, we must think of ways to teaching him towards the right path. (By talking, by advising, by giving indirect message through his close friends, by sending emails or SMS etc)