How realistic is that, considering Roe v Wade, Doe v Bolton, etc? But as for "legislating morality," we're not talking about dancin' and drinkin' here. The people working to ban this do so because they believe it is a form of murder. And you can't really put that in the same category as outlawing smoking or sodomy.
And the people who stage destructive but non-violent (well, they try for the most part, and harm to humans is rare) protest against animal experimentation and gas guzzlers (ALF, ELF, etc.) are also concerned with preventing murder -- they see themselves as protecting the life of research animals, on one hand, and the life of the ecosystem (or substantial parts of it) on the other.
It's all a matter of perspective. We all understand the concept of murder, and we pretty much all agree it's bad. We just don't agree how far the concept of "murder" should extend. A human foetus is genetically human and alive, but cannot sustain itself biologically until way past 6 months, notwithstanding the recent 23-week delivery that made headlines. Delivery doesn't mean squat. Babies that premature have to stay hooked up to machines for a long time.
Just because something is "human" and also "alive" doesn't necessarily mean it's person with rights. You can take many types of cells out of a human and grow them in a lab, at least for a while. They're alive and they're human, but toss the petri dish in the garbage and you haven't committed murder, hopefully.
If (I think it's more "when") certain cells from an adult body can be stuck in a suitable environment with the right nutrients and hormones and manage to grow into something resembling a human, will killing one of those cells qualify as murder?
The gruesome description of PB abortion is just an appeal to emotion. If someone doesn't believe the foetus qualifies as a human being with rights, PB abortion is yet another in a long list of medical procedures that's not for the squeamish.