I have an uncircumsised son and circed hubby. The procedure is not routine nowadays in Australia where he was born (I get the impression the same goes for Hong Kong) and I was not interested in inflicting what I considered unnecessary pain on a newborn baby. Around the time he was born I saw a piece on 60 minutes which showed the process and I was horrified. I guess I don't consider it my place to remove part of his genitals when he is not old enough to know any better. We are usually outraged at female circumcision but we don't always seem to apply the same reasoning to little boys.
Understandably, my husband initially thought it should be done but son 'matching' dad was not a good enough reason, and he was unable to come up with any other good reasons so it was never taken any further.