Your logic errs in the highlighted part above, plus the fact that you have no idea what the actual reason for each individual uncircumcised man not choosing to be circumcised is.
The reasons are
irrelevant, don't you get it? That there
are reasons is what is relevant.
If there are good reasons that natural men choose not to be circumcised, then the position that there is no good reason
not to be circumcised is proven incorrect. This is all I am trying to say. Most of the pro-circ crowd misinforms people, either purposefully or out of ignorance, that there really isn't a good reason to have a foreskin. I claim that if that were true then we would see a much greater number of men having adult circumcisions. Frankly, I think you are too intelligent to argue with that. Are you just playing the devil's advocate?
Er ... comparing proof of men's motives for getting circumcised and proving the non-existence of god are somewhat different, when you think about it. Think about it - don't you agree? What's stopping you from doing your scientific research?
Of course I was exaggerating with the god comparision, but the point remains valid I think.
I used to be into this debate, a few years ago, and I read nearly all the literature available from both sides of the issue. What I remember is that of all the studies that mentioned adult men being circumcised, and all the testimonials on all the web sites I looked at, there was
no mention of a man having a circumcision on a whim. There was
always a good reason -- medical, cultural, personal, whatever. In other words, natural men don't appear to view this procedure like getting your ear pierced or getting a tatoo -- activities men
do undertake on a whim.