Because facts are very useful things to have in your tool belt when arguing your point:
Women do not suffer mental health problems such as depression or post-traumatic stress disorder as a result of having an abortion, researchers reported Wednesday.
The study, published by Danish scientists in the New England Journal of Medicine, adds to a growing body of scientific literature that has failed to find that abortion causes psychological problems, as some abortion opponents have asserted.
Too bad there are too many people who don’t care about science or facts. Oh well, they’re a lost cause anyway.