Islam is an insane murder cult.
A devil's advocate could argue that at least they kill someone (or I guess they might argue, something- a woman) that has wronged them by virtue of their (its) actions.
Many western (enlightened) societies on the other hand, dispense with the four month penalty and instead proceed to outright sanction, nay codify, the elimination of fetuses (at a rate far in excess of honor killings BTW).
The enlightened society attempts to get around this thorny logical connundrum by saying that we are not a barbaric society, because we believe that abortion does not kill a human being or by trumpeting a waman's "right to chose".
In the honor killer's eyes, western society's degradation of the value of a fetus' life is worse than honor killings, as the victim of abortion (i.e. fetus) has done nothing against the perpetrator (pregnant mother).
Bottom line, if your position is pro-abortion, I think it is difficult to rage against these nuts for their killing of lowly females who have wronged them vs lowly fetuses that, by no fault of their own, are suffering dismemberment at that hands of a surgeon carrying out the will of an inconvenienced woman craving hassle-free sexual activity (let us exclude discussion of abortion for rape etc, where the woman had no choice in the sex act).