We know abortion is a nasty business. It is intrusive and profoundly unsettling. It is a frantic attempt to halt the inexorable development of something, which means making quick, irreversible decisions. It is extremely stressful. It is not a shrug of the shoulders.
Nobody wants to have an abortion.
But we have to uphold a woman's right to make this decision for herself. It's a matter of free choice. To this may be added a few points about whether a fetus is a human being, the problem over-population and so forth. But the bottom line is the defense of choice and freedom. Abortion is upheld on the principle of freedom of choice.