Do not rejoice when your enemy falls, And do not let your heart be glad when he stumbles; (Proverbs 24:17 NKJV)
It is human to rejoice when someone we don’t like falls into trouble. We think they are getting what they deserve. But, Jesus came to die for them also. Pray for your enemy. Jesus came to seek and save the lost which includes us and our enemies.
But I say to you, love your enemies, bless those who curse you, do good to those who hate you, and pray for those who spitefully use you and persecute you, (Matthew 5:44 NKJV)