What Thomson is granting, then, is a view of personhood consistent with the pro-life position only insofar as it is aligned with a minimalist understanding of autonomy and choice. That view isolates the individual from other persons – generationally, contemporaneously, and institutionally – except as those relationships arise from the individual’s explicit choice. But that is not the pro-life view of personhood.
You can read the whole Catholic Thing entry here.
For those who are interested, the August 3 symposium went very well. Chaired by David Boonin, the other participants (besides me) were Don Marquis and John Martin Fischer. As I noted in my opening comments that evening, if this panel were the Beatles, I would be Ringo. It was truly an honor for someone with my modest accomplishments to be included with such giants in the discipline.