Greetings, While I agree with your conclusion, your argument appears to me to reduces to legality = morality which is a form of relativism that we should reject. Also, the early Christians did not serve in the military. Christians in the military didn't start until Constantine. To wit: Justin Martyr, Athenagoras, Irenaeus, Clement of Alexandria, Tertullian, Origen, Cyprian, Lactantius; all these early Christians testify that the church was (and is) opposed to military service. Besides the killing part how could you even enter the military service without taking an oath of which we are expressly forbidden? The reason it is wrong to kill abortion doctors is because it is wrong to kill in all situations. Recall the Sermon On The Mount. Blessings