Brothers, if someone is caught in a sin, you who are spiritual should restore him gently. But watch yourself, or you also may be tempted. Gal 6:1 NIV
When a shark is injured in the wild their friends may turn and devour them. This is the way that sharks behave when there is blood in the water. Often as Christians when one of us falls, the pack turns on them and starts ripping them to shreds by gossip.
Face it, we have all fallen short in the sin area, and it only takes one sin to be guilty of the whole law. Without the forgiveness provided through the Lord Jesus we are all lost. Most of the time people do not need you to tell them that they have fallen, they already know that better than you. They need you to help them back up.
If you know someone today that has fallen, be kind. If the Lord has already forgiven them, who are we to point at their past. Gently encourage them, and help them get up.