I was thinking on this.. esp. Brat's leaping to the (very common) defense of "cleanliness".
JUST WASH!! We don't cut off fingertips to avoid dirt under the fingernails, nor do we pull teeth to avoid possible tooth decay. [I seem to remember, though, that "preventive" hysterectomies hit a height of popularity in the '60s/'70s..]
To me it all ties in with a creepy anti-sex vibe as I grew up in the US. Better to slice off a 'dirty' part of the penis than to WASH it.. which COULD involve more than a few seconds of SELF-TOUCHING on practically a DAILY BASIS!!! Which is obviously to be avoided.
I think of my mom, with her preventive hysterectomy, getting agitated because "WHAT was I DOING in the shower FOR TEN WHOLE MINUTES!? (not an issue of water or heat cost, believe me). It wasn't 'til I left home that I even "got" what that tone of tension was all about. It was the same borderline psychosis that viewed bidets as blatant and offensive badges of sexual licentiousness rather than convenient aids to mundane personal hygiene.
I guess I came from a not-uncommon American bkgd. of a certain era in which not only genitals but any 'private' bodily need or function was shoved into the tiniest mental, physical and temporal space humanly allowable, lest be opened the family floodgates to day-long orgies of who-knows-what in the powder room.
At almost 49 I still get crap from my mom for public nose-blowing (with Kleenex, of course). Good thing we don't circumcise noses!
-----
The interesting thing (to me) is that I can't even identify a separate "foreskin" on an uncircumcised adult male; I think even some of the diagrams I was shown in school and encyclopedias of the time and whatnot were (willfully?) incorrect. The only thing I can imagine being cut away is a marginally random swath of whatever "extra" skin happens to seem to be around the shaft when it is not erect. In "real" uncut life it's all continuous skin from the glans to the abdomen, without particular distinction (as far as I can tell).
For example, as a "laywoman"
I would aver that this is an unrealistic and deceptive diagram:
Acucullophallia - definition of Acucullophallia in the Medical dictionary - by the Free Online Medical Dictionary, Thesaurus and Encyclopedia.