It may or may not.
But loving your enemy will change you to become more like Christ
And hating your enemy will change you to become less (and more like your enemy)
This is the point.
Oh my - - and in case we become hateful and unforgiving like our enemies, we could spend eternity with them!!
"Father, forgive them, for they do not know what they do." (in Luke 23:34)
Jesus prayed this, right while Jesus was on the cross.
Our Heavenly Father plans to change us into how Jesus is > Romans 8:29 > so we may spend eternity with Jesus in His family way of loving. And God is the One able to so change us.
Trust our Father, then, to change you so you are so humble and kind and generous like Jesus.
And notice how that criminal trusted Jesus to save him . . . after Jesus prayed forgiveness to the ones who were hating and torturing and murdering Jesus. I see how that prayer of forgiveness ministered God's almighty power to change that criminal into a brother of Jesus. So, yes, in God's way of prayer and forgiveness, we can minister His love's power almighty to so affect anyone. And even if it does not change a certain person, it can go to others, as God knows will happen.
So, one enemy might make it look as though your love and prayer for the person is in vain; however . . . 1 Corinthians 15:58 guarantees how our labor in Jesus is not in vain.
Perhaps it is like if you give a five dollar bill to an enemy. The enemy might buy booze with it, yes. Then, though, the store owner can use the five dollar bill to buy food for the owner's family. The grocery store then might use the five dollars to purchase food to sell at a special price to a needy person. Then the needy one donates five dollars to a missionary. The missionary uses five dollars to help the missionary's child to get a medical education. Then the child becomes a researcher who helps find ways to treat cancer, then matures to become a pastor. The pastor then uses five dollars to help buy a prisoner a Bible, on death row. The man repents and gives the Bible to a guard, who then uses five dollars he did not use to buy a Bible, but uses his five dollars to . . . .
So God is able to use evil for His all-loving good. Yes, the enemy used the five for booze, but then the five dollars got trapped in the hands of endless people using it for good.
In God's hands, this is. You put forgiveness in God's hands. You are wise to not claim, then, what evil might do!