You are correct in observing the provocative and controversial usage of the term 'genital mutilation' to describe male circumcision. I myself can find the term counter-productive at times. Although I think it can also be very useful in making people think.
'Circumcision' is a euphamism, in my opinion. When barbaric and harmful practices hide behind medical or theological euphamisms then we have a situation to the opposite effect. Calling the destruction of significant brain tissue by applying an ice-pick through the eye-socket and moving it around a "labotomy" is a prime example of this. I'm sure you can think of a host of examples in politics and law where words are manipulated to similar effect.
What I would ask of you is to look beyond the words to the reality of ripping and cutting off healthy functional erogenous tissue from the genitals of newborn male babies. Doing anything of the sort to a female baby is illegal in your country. You wouldn't even consider doing a trial to see if female circumcision had any positive medical benefits. And you seem incapable of addressing the issue that you, along with millions of other males in your country, may have lost a significant part of your penis which has had an effect on your sex life. Additionally, being an adult now, you were probably circumcised without anaesthetic. You must concede that this may have had a traumatic effect on your fragile infant psyche.
Concepts of objectivity and neutrality can be taken too far when a person seems almost robotic and totally cold towards a very human and emotional subject. In such cases I think it is a psychological defense against feeling pain. And that is understandable, but it cannot be passed off as "science". You obviously have a strong intellect and a good command of language, but I think your mind may be getting the better of you in this instance.
Being an scientist (or an atheist, for that matter) does not mean leaving feelings, emotions and passions at the door. It is after all the passion for truth that has fueled some of the greatest scientific discoveries. And many if not most of the great geniuses have given equal credit to intuition as to reason. As Einstein once remarked, "The intellect has big muscles but no personality". There is no legitimate scientific or philosophical principle which says that truth is the sole property of the head, and as humans and earnest seekers of the truth we must give due consideration to the workings and promptings of the heart.
From what I have seen and heard of stories of men who have had their lives destroyed or terribly damaged by this procedure, I find it a very serious subject indeed. From my knowledge of the mechanics of money and power in a consumer society which is epitomised in the USA, I find America's preoccuption with this practice very troubling indeed. And as a gay man who has an appreciation for the male form and who has seen first-hand how disfiguring and debilitating this surgery can be, I find this total lack of respect for the body and the genitals of others to be very disturbing indeed.
I speak from experience when I say that the foreskin is not in any way a vestigial organ, and I would presume to say that its sexual functions are known to many intact men and their partners. Anyone who would suggest otherwise has simply never had the opportunity to know. Now, sex and pleasure can be very personal things and so the foreskin is probably more important to some men and women than to others. But this in no way gives us the right to deprive people of all the parts they were born with. Surely this is plain.
I think it's quite simple: if you want to slit your dick you can but you have to be a grown up, either to do it to yourself or to give anyone else permission to do it. The fact that this even has to be stipulated doesn't speak well of our society.