I think a lot of people who make this choice are more likely to buy into what the 'authorities' are telling them to do, whether it's circ or something else.
So my response a few times has been:
"Oh, well, our pediatrician does not recommend circumcision. She told us that the AAP no longer recommends it either." (I also use this reaction for episiotomies and bad breastfeeding advice) IME, hearing that an *authority figure* was my first advice not to [circ, etc.] then makes people pause to think a bit more. I will often elaborate about the facts if we talk beyond that point, but I think that just bringing up the fact that our doctor is opposed, is enough to make quite a few people re-think their positions. 
(and, this is actually true, too - we were in the "well, why would we?" camp in re: circ before our children were born - hadn't researched it at all but could have been swayed in either direction; and our Ped was very outspoken when we interviewed her, about the fact that there is no medical reason to circ and that it's not recommended etc. etc.)
So my response a few times has been:
"Oh, well, our pediatrician does not recommend circumcision. She told us that the AAP no longer recommends it either." (I also use this reaction for episiotomies and bad breastfeeding advice) IME, hearing that an *authority figure* was my first advice not to [circ, etc.] then makes people pause to think a bit more. I will often elaborate about the facts if we talk beyond that point, but I think that just bringing up the fact that our doctor is opposed, is enough to make quite a few people re-think their positions. (and, this is actually true, too - we were in the "well, why would we?" camp in re: circ before our children were born - hadn't researched it at all but could have been swayed in either direction; and our Ped was very outspoken when we interviewed her, about the fact that there is no medical reason to circ and that it's not recommended etc. etc.)








I'd never use my personal experience though in an argument, unless it was asked for directly.


