You explain it by understanding the religious brainwashing of Ameericans. Americans have an issue with sex outside marriage. American men see women as sexual possesions.

The see abortion as a way for a non-married woman to get away with having sex outside marriage. By not being allowed to have abortions, they force women to be more careful about having sex outside marriaage. Same thing with the pill.

This is a result of Americans never having joined either the 20th or the 21st centruy. They're still stuck in the dark ages and think there is something wrong for women to have sex outside of marraige.