When they affect your health, well, yes.I noticed that you are pretty much scared of things.
Why would a sane and reasonable man subject himself to swallowing pee, copious amounts of bacteria and viruses in public swimming pools?
Did you know that people do pee in swimming pools? That they spit too? What about those who lao sai (pass watery stools) into the pools?
Some women who are menstruating insist on swimming in pools. And some women have fungal infections in their private parts. Despite their doctor's advice, they go ahead anyway.
That's not all. Men who contract chlamydia from their sex partners unwittingly spread the germ into the pools.
And I could go on to list many more, ad nauseam.