From what I could find on drownings municipal pools account for less than 1/10% of total.
And for the small cost of that negligible number, millions of kids developed the deep-water skills to survive the unsupervised visit to the lake or ocean.
Now these kids, left to their own devices, will die in far greater numbers when they walk out into that natural water, and HORRORS! it goes right over their heads.
Blub glub gurgle gurgle.