While I am firmly pro-choice, I am not sure that from the fact that a being cannot feel pain or have experiences or even interests, it follows that it is ethical to kill that being.

Well, like I said there are other arguments for outlawing abortion, notably that 'human life has intrinsic value' whether or not it has rights. So the argument above is insufficient by itself to justify a pro-choice position. But it's absolutely necessary. Indeed, if not for it I'm not sure I would be pro-choice in the first place.

But it is a philosophical argument.  And half the people in this debate frankly are not swayed by philosophy.  Much in the same way that I am not swayed by the Bible.

Philosophical argument is what I do, though not so much here on ET (philosophy is no spectator sport). Such argument may or may not make for good propaganda, but that, to me, is a side concern.

since we are here at ET, what's the scene in Europe?  I keep hearing the Pro-Lifers are gaining support there.  True?  Is this just a Catholic thing or is it more mainstream?

I can only speak for Scandinavia, where pro-lifers have given up long ago with respect to swaying the mainstream. The demographic in question seem much more  preoccupied with writing LTEs about Israel.

The world's northernmost desert wind.