It isn't. The vast, vast majority of abortions are carried out relatively early in pregnancies. The foetus doesn't resemble that image. It is a collection of cells, which do not have a personality, an identity, feelings, emotions, the ability to feel pain - anything that makes us human. It is no more wrong for a woman to abort a foetus than it is for a man to "abort" his sperm by masturbating, wearing a condom, or having sex with someone he knows won't become pregnant as a result - but none of these are viewed as murder. The only reason abortion is seen as wrong is because it has been exploited as an issue to disenfranchise women of the right to control their own bodies.