Well, that's an interesting question, actually.
First, you can't expect a human to remain impartial and faithfull to his ideology in practice. Just like Hume, I find that quite impossible. I will say that I care about this world because I live in it - Life is a fact, after all. I don't think it is a particularly good world, and I'm not stoked about the fact that I WILL eventually die, but I might as well make the best of it.
If I had never been born, I would not be sorry.
As for what you said, I don't have a problem with that. However, I personally don't deal with what-ifs. People might get happy, or they might get sad (Hitler 2), but ultimately, does it matter if these people are going to die anyway? For an atheist such as myself, not really.
In practice, obviously I would like it if there were no abortions, but if it is deemed beneficial to terminate the child, I would have no problem with that, either.
