In a sermon, I said that if our favorite terrorist, Usama bin Laden came to the door and asked for a cup of tea, what would you do? If he had a gun, I might run, but if not should we not give him the tea? Several people suggested that a shotgun blast might be more appropriate, but consider what the Lord says: "Give to the one who asks you..." and St. Paul in Romans 12:17-18 says: "Do not repay anyone evil for evil. Be careful to do what is right in the eyes of everybody. If it is possible, as far as it depends on you, live at peace with everyone." In Luke 6:32 Jesus says: "If you love those who love you, what credit is that to you?...and Lk6:35 "But love your enemies, do good to them..." How else might peace begin if not by doing good to your enemy at least in some small way initially?
It should be clear that Jesus himself loved his enemies. Consider that the religious leaders hated him, but he never said to anyone that they should be harmed. He willingly died for them and for us, who have hated him when we sin.