The mere legality of a practice has no bearing on what the citizens of a nation feel about that practice (see "jury nullification" for real-world examples of this). Abortion is the slavery of the 20th (and now, sadly, the 21st) century, and will be looked back by future generations with the same horror and revulsion. Just like with slavery, it is the moral argument that will prove to be the greatest weapon against abortion. And that is why we should never abrogate our right nor will to use it...
Well yes, that's true. It was first necessary to convince the public that slaves *were* people. Same thing here; if you want RU-486 banned, you're going to first have to convince a sufficient percentage that abortion (specifically very early-term abortion) is murder. But that has not yet happened, and absent such a consensus the potential risk of RU-486 to the mother is far too low to justify a ban by itself.