Or some women decide to end a pregnancy for reasons which may or may not be valid. One important difference between those two decisions is that the woman's decision has way less impact on you and me than does the group decision to wage war.
In terms of flawed human society the impact is the same. Both devalue and cheapen life. The abortion industry can be thought of as "war". Each aborted child can be thought of as an innocent civilian. You compartmentalize the entire abortion issue down to an individual. If you use that same compartmentalization in a fighting war, you would say that we can't condemn war because we can't judge the actions of each individual soldier. After all, we can't judge what that solider is thinking or doing, his situation, or his reasons for shooting at that time. Sometimes it may be valid, sometimes not. Therefore we shouldn't condemn war.
I have said that if we condemn abortion then we should condemn war - they are both wrong. The entity which decides about war is a country. The entity which decides about abortion is a pregnant woman. Our country does not want to give up its right to choose about war (ie. to the UN). It seems consistent to allow pregnant women the right to choose about abortion. In a perfect world, no one would choose to do either but we are not living there yet.