Jesus said to love your enemies, but why...?

Jesus said to the people to love their enemies and "pray for those who persecute you". (Matthew 5:44) I had a question. Why then those followers of Jesus began to hate certain people and certain faith group and even justify their killing or murdering them? Not only that, why did the followers of Jesus begin to hate even their own people who love the same Jesus, just by the name of heresy? What about witch hunt? And again, not only they hated them, but justified their murder.

Here's what I came to understand. Of course, my understanding may be still very shallow. Somehow in the course of time, the number of the followers of Jesus grew and they overcame many obstacles. As they attempt to defend their faith against many oppositions, they began to put the label on certain people. You are the Christ-killers. Who could kill the Christ? Only devil could. Thus they labeled certain people as the devil. Of course Jesus told them to love their enemies, but he never told them to love the devil! Therefore, when they labeled certain people as the "devil", that gave them the justification of their hatred and even the murder of the people. This labeling is so powerful to destroy people, and especially when it's done in the name of God. Therefore, when Jesus looks at today's world, especially those "followers of Jesus", he would be in so much pain and suffering.

Therefore, when you are about to label someone, just be careful. When your friend is labeling someone, just be aware. It is a good time to remember that he said "Judge not that you be not judged." (Matthew 7:1) Who am I to make a judgment on someone by labeling him? We need to be aware that, as he said, if you judge people, you are also placing yourself on the table of judgment without even realizing it. You are digging your own grave. Therefore, before you make that one choice to place judgment on someone, just talk to your conscience and figure out what God would want you to do. I believe human conscience is an amazing resource for us to connect to the Divine. We just need to polish it. And I believe our daily effort of thanking would help.