I am not sure what's your point, but Hurricane Katrina was not a human-made catastrophe.
But you are somewhat right. Katrina is a better comparison with Fukishima which, to my knowledge, was a combination of being a poor location and repeated environmental damage that wasn't properly repaired or maintained. The 2015 Tianjin explosion is a better comparison with Chernobyl as that was human error and poor maintenance, not "act of god" weather.
But I was specifically referring to the idea that Katrina was completely different as there was no human error involved in there.