Something I find interesting about these analogies is the introduction of exciting new emotionally significant detail — a famous violinist, a firefighter — while the emotional detail of the situation being supposedly discussed (a woman seeking an abortion) is not discussed. As Emily put it above, "the most germane point in the abortion debate: any reference to the person who wants the abortion" seems to get wiped out in the analogy.
You know that framing it like that is already presupposing a great deal about what conclusions one wants. In a taxation or draft frame, no one talks about whether the draftee or the combatant nation or tax-payers wants to be coerced; in a discussion of crime like mugging or murdering, no one talks about whether the murderer wants to murder.
The response to a frame like 'think of the woman's preferences' is to frame it another way, 'think of the famous violinist'. If the frames differ and the introduction of an 'exciting new emotionally significant detail' could possibly change your appraisal, well, you've learned something very important about your appraisal...
A few years ago, I wrote a little dialogue I imagined between 2 materialists, one of whom was for and one against abortion, centering on the personal identity question. I recently cleaned it up and added a number of references for the biological claims.
You can read it at An Abortion Dialogue.
Early feedback from #lesswrong is that it's a 'nicely enjoyable read' and 'quite good'. I hope everyone likes it, even if it doesn't exactly break new philosophical ground.