Some call it judging or meddling, others say, “mind your own business” but the Pope calls it mercy. In a recent message for Lent the Holy Father said,
“The Church’s tradition has included ‘admonishing sinners’ among the spiritual works of mercy. It is important to recover this dimension of Christian charity. We must not remain silent before evil.
“I am thinking of all those Christians who, out of human regard or purely personal convenience, adapt to the prevailing mentality, rather than warning their brothers and sisters against ways of thinking and acting that are contrary to the truth and that do not follow the path of goodness.
“Christian admonishment, for its part, is never motivated by a spirit of accusation or recrimination. It is always moved by love and mercy, and springs from genuine concern for the good of the other.”
– Pope Benedict XVI for Lent 2012
On the Day of Judgment you will not regret warning the sinner of their evil ways, and if they follow your charitable advise they will be glad you did it. If they reject you, they will, on the Day of Judgment, wish they had not rejected you. We have a job to do in a sinful world.