For people that have rational minds. What about people who are irrational or have some sort of mental illness? I guess that's just a "too bad" for the person who is now dead?

Yes its too bad when I'm dead. I could done anything I could have done to prevent that but there will always be somebody who are irrational or have some sort mental illness or anybody who could eventually find a way to kill me if they really want to. This is happen in open or private society.