I think the terms circumcision and circumcised are good enough, LadyB.
That may be what it means, runnybottom, but that's not actually what LadyB's dictionary definition says.
I understand you're trying to condemn the parents who choose to have it done, and I understand why - you have every right to, I guess. But I think that you run the risk of actually offending, or at least pissing off the boys/men who are circumcised by saying they are mutilated or pitying them. Whether they were circumcised for medical reasons, or because it was inflicted on them by barbaric parents, they are not to blame, as has been pointed out by those who think they should be able to sue their parents. I also highly doubt that circed men would want your pity, I think that's quite a patronising attitude.
I also think that comparing it to female circumcision and having an appendix out is nonsensical, there are massive differences.
However, I do think OP should bear these views in mind as examples of the kinds of things that will be thought/said about her and her DS if she does go ahead and it will hopefully give her cause for serious consideration.