Yes, you must show mercy to others. If you do not show mercy, then God will not show mercy to you when he judges you. But the one who shows mercy can stand without fear before the Judge.
But, Lord, you do see the pain and suffering they cause. You see it, so punish them. Those who were left helpless put their trust in you. After all, you are the one who cares for orphans.
They said to each other, “We are being punished for the bad thing we did to our younger brother Joseph. We saw the trouble he was in. He begged us to save him, but we refused to listen. So now we are in trouble.”