I love my enemies to the extent that I appreciate why they exist. My enemy exists to test my courage and my skill. So, esentially, I can smile at him before I turn his brains into tapioca. There should be no pleasure in the transition (from brain to tapioca) though. This because, above all else, a life is being taken. A regard for life should be apparent in all walks of life, even war. This is why toruring is so cruel. If you have no other choice and this person or group of persons is threatening you, then you have to defend you and yours. Exterminate them. However, do it quickly and also give them a proper burial. This could be viewed as loving one's enemy also.
"Die before you die."-Prophet Muhammad (Pbuh)