According to the noaa archives, it wasn't a hurricane 5 days before and LA had about a 2-4% chance of being hit by Tropical Storm Katrina at THAT point in time.
I don't see them being able to convict both the owners AND the employees on this one. IF they were under mandatory evacuation and had adequate opportunity, time, and resources and the owners refused to do so... does not mean that the employees had to buy into that stupidity.
They don't have to convict the employees. However, all of them who are licensed should either lose their licenses or have them suspended. I take it you are neither a doctor nor a nurse. We have ethics. These people ignored their responsibility to their patients and allowed them to die.
There was a mandatory evacuation and the owners chose not to evacuate.