LOL…if you find such a pool, I’d love to know about it! The only place I can imagine not letting children in for play time is the King County Aquatic Center in Federal Way (at least the competition pool). Their water temp is too chilly for playing around in, but the diving well is another story.
I’ve swam my entire life and have never given much thought to someone pooping in a pool. I just think back to Caddyshack when everyone panicked over the candy bar in the pool and laugh it off. It’s gross, but chlorine will take care of it. I’ve swam in a lot worse lakes or over-chlorinated pools that will probably give me lung cancer to literally not be bothered by crap.