As someone with kids who are 5 and 3, and having a pool put in two years ago, there is no safety substitution for vigilance. You can have all the safety measures in the world but human error exists and deems them ineffective. Whatever preventative steps you take are only as reliable as the adults in charge. Tragety happens quickly. It can happen to anyone, anywhere. And as unbeliably awful as this is - I read these headlines as a reminder to myself how serious of a responsibility having a pool around young ones can be.