I could have done better. Everyone involved could have done better. I'm not saying anyone could have saved his life, but we did all fail him, some more than others.
I think there is immense value in the sadness though. It teaches us the value of things and it teaches us to do better, to try to avoid these losses in the future, which is not always possible, but it helps and we can use the tools nature gave us to do the best we can.