I can make a better case for banning all pools than they can for banning sniper rifles. I guarantee that more people drown in pools than are killed by .50 sniper rifles each year and *oh my gosh* most of the deaths are kids. So should we fill in all pools. Well, no, people enjoy them. BUT THEY'RE DANGEROUS. That can be true, but exactly when are they dangerous? When unsupervised children or those who don't know how to swim are in or near them. Thing is, if used properly, they're a great way to cool down and blow off some steam.
By the way, thats just with drownings. That doesn't even get into accidents caused by slips, mess-ups on diving board, or just general rowdiness that can result in death, paralysis, etc.