Kant's argument is that the moral praiseworthiness of something is going to depend outside of morality, but claims it is only worth praising if intentions/motives were moral.
If intentions/motives are moral, it is easy to mistake a big problem Kant saw: I am getting an abortion so my family can keep me to take care of it. In Kant's view, this goes against his donor example (killing one to save many).
He gives an alternative view: I am going to get an abortion to save my family...at the cost of a human life. Because of this, abortion cannot be deemed praiseworthy correctly in Kant's view, although outside of morality, that is not the case.
I still fail to realize, given what I have shown, how this takes my argument of abortion being murder and arguing against it. I don't feel like it is getting us anywhere.
Basically, I feel like you guys are trying to show when abortion is praiseworthy...but Kant says that will not happen in philosophy until you can show abortion is morally permissible in the first case, if there is any case which I say there is not.