Abortion is one of the greatest scourges ever. The idea that killing an innocent, potentially (if not definitely) sentient life form on the excuse of convenience is always wrong.
What abortion allows is casual sex, prostitution, and other immoral acts with the only repercussion being... what exactly? Intense psychological damage, not to mention potential physical damage (still unclear). Therefore, even in any case, abortion is wrong.
Abortion kills an innocent baby with no chance to defend itself and leaves, in its place, a couple pounds of "biowaste", or whatever they've taken to calling it. An unborn infant is still an infant.