They're just cutting out the middleman is all.
I think you are trying to differentiate between different kinds of activists though ~
Well, I dont even believe the pro-choicers who support abortion would remotely consider themselves in that group of murderers. We might think of removing a viable fetus as murder, but they don't see it that way and debate when humans actually gain conciousness/awareness/self-sustaining. At least that's what I've read, it still sounds very cold & callous, but I think I even get the distinction of where they're coming from. I still don't think we'd get very far in an argument using this study.
But I have a few more posts to catch up on.. maybe later the light bulb will turn on!