“The idea of older men watching pre-pubescent girls at the pool is actually kinda creepy.”
Your premise is in need of revision.
You imply the visual presence of adult males at their daughter’s swimming class is a prurient sexual situation.
Sources, please.
Also, please be so kind as to omit articles authored by, the whirling eyed droolers from the assorted religious extremist sects of whatever faith.
As a dad of only girls, it is always a shock to my system to encounter unexpected roadblocks in my daughters' extracurricular activities that I just don't expect. I can't take a lunch to my daughter at her dance recital, because there are other girls also in the room with her, presumably also eating their lunches. I fail to see how being in the presence of a room of prepubescent girls should somehow be forbidden for all fathers. Neither the situation nor the girls are sexual in any way, except for that implied by the policy itself.
Even the act of dropping her off and picking her up from dance sometimes grants me suspicious looks askance from instructors and mothers.
I suppose the policies are in the general interest of the girls at large, or are at least intended to be so, and therefore intended to be also in the general interest of my daughter. But when I look at any other dads treated the same way, I don't see predators - I simply see the fathers of my daughter's friends.
Perhaps I am naive, or perhaps I am rightly, deeply offended at the presumption of guilt simply because I happen to be the father of girls.