In our world moral decisions are often complex --- not clearly black or white, but a murky shade of gray. Actions often seemingly immoral may still be the better choice. For example, a German Lutheran minister, Dietrich Bonhoeffer, participated in a plot to kill Adolph Hitler. Although he believed murder was immoral, the horrible situation in Germany under the Nazi regime overrode his commitment to pacifism and nonviolence, and brought him finally to the murder plot. He reasoned that the guilt accruing to him for murder would be less than his guilt for doing nothing. As he saw it, he had to choose between the lesser of two evils. It wasn't the right choice but it wasn't the wrong choice either. Decisions about unplanned pregnancies are not infrequently like Bonhoeffer's choice, a very dirty shade of gray --- however much anti-abortionists try to convince us that the choice is always black and white. For people of conscience, however, legal actions are not always moral, nor are illegal actions always immoral. It depends on the situation.
Above taken from:
(MIS)USING the BIBLE in ARGUMENTS AGAINST ABORTION by Charles W. Hendrick, Professor Emeritus, Missouri State University