5 Whoever slanders their neighbor in secret, I will put to silence;
whoever has haughty eyes and a proud heart, I will not tolerate. Psalm 101:5

When you slander someone, you look foolish and petty because the person being slandered cannot defend himself. He doesn’t know he’s being slandered. It’s really not his problem.

The tongue gets us in trouble more than we know. Yes, it does have he power to bless but it also has destructive qualities too.

But no one can tame the tongue;
it is a restless evil and full of deadly poison.
With it we bless our Lord and Father,
and with it we curse men,
who have been made in the likeness of God. James 3:8

There really is no “upside” to slandering someone, except perhaps to offload something that’s been on your mind.

Perhaps, then, it’s just better to hand it all over to the Lord anyhow before your tongue gets you into trouble.