I don't think that there are varying degrees of evil. Something is either evil or it isn't. When we compare the murderous dictators of the world, can we say that one is less evil than the other because he was responsible for fewer deaths? Was Hitler less evil than Stalin because he murdered six million rather than 20 million? I don't think so.
Do you then want to equate the aborting of every baby with the murder of every innocent human being by a savage terrorist? I'm not minimizing the misdeed of abortion, but can we keep things in proper perspective? Why not then send the US Military into every abortion clinic in the country with submachine guns? Abortion is wrong, it is not murder.
One more question: If it is either the mother or the fetus who can be saved, who do you save the mother or the fetus?