Bumping this thread because I am still interested in reading any allegories or analogies that anyone else can come up with to illustrate these same points.
Frankly, I think Ms. Thompson's "violinist's" allegory works just fine.
From what I can tell, it seems you place the same value on the life of a fetus as you do on the life of a a born person. Now you may not like it, but the fact is that in an environment where individuals must make choices, the life of a fetus, or even a born infant, just isn't as valuable as that of a matured adult. As much has been empirically shown by Olof Johansson-Stenman & Peter Martinsson in "
Are Some Lives More Valuable?" wherein they found that "the relative value of a saved life decreases with age in a pattern that is consistent with a discounted utilitarian model, with a pure rate of time preference of a few percent."
Look at the results they obtained and reported in Table 4. Looking at it, one sees the value of a life of a ten year old is less than that of a 30 year old, but more than that of a 50 or 70 year old. In other words, the value of a human, is lowest at the start and end of a human's existence.
Now I realize a lot of folks don't care to deal with the brutally empirical nature of studies such as Johansson-Stenman and Martinsson's, but the reality is that we must, and in fact we do apply the findings in a very practical way. It may not occur to many folks but findings such as those noted in the paper are exactly what actuaries use to determine life insurance premiums. Indeed, the lack of/indeterminate value of a fetus is partly why one cannot get life insurance for a fetus.