When you have Americans telling Africans to get themselves circumcised you do have to wonder what is really going on, particularly when there is this dubious level of 'science'.
In the U.S. there is always the profit motive. Hence male circumcision is sold to parents as hygienic and beneficial, they go along with it and the hospital makes some money, everyone getting bonuses except for the baby boy.
To contrast with this profit-motive-situation you have places like the UK where healthcare is provided by the government - e.g. the NHS. The hospital has no financial incentive to circumcise as many boys as possible, doing so would be a cost, not a profitable thing, so it doesn't happen. Therefore the population ends up being un-circumcised as a general rule.
By adulthood men have had long enough to rationalise with what happened to their foreskin. If it has been removed then they tend to want this for others including their own boys. Meanwhile, those with intact foreskin don't talk about such matters in public as they know that open discussion will deeply hurt someone in the room who has been circumcised.
I think that this experiment to circumcise millions of African men for their own good would have been easier to get to the bottom of if everyone involved had to explain their viewpoint in just their 'birthday suit'.