I didn't side step your comment, it does not seem relevant to the conversation and you have absolute no knowledge on the psychopathy of people to make any statements of what could or not could be "scenarios"
Your position is that you would fire the person based on the below
Your premise here is that a person with suicidal tendencies could have the ability to harm or kill other employees, otherwise why else would you say "for the sake of the other employees"
you then swivel to
So now you trying to claim it is to protect the employee himself (pull the other one)
A person who is suicidal is generally not suicidal about one thing (such as a co worker telling him his work sucks), if a person tries to kill himself it is generally a psychological thought process over time and so he has been thinking about it and contemplating it for a period and not just over one incident such "as Karen telling me my works sucks". Hell the shops not having the right ham in the store could push the guy over the edge. we going to stop people going to the stores now.
People who have tried and failed to commit suicide can actually be a blessing because they can then get the treatment they required as they may not have known they had a mental issue previously and thought that "this is just normal" but they don't like this "normal"
The real concerns are the people who have narcissistic personality disorder and similar mental issues. They are the ones that will shoot up schools and office blocks because they didn't get their way. They also tend to want to hurt others before they will hurt themselves
Also I cannot understand your logic.. how I am supposed to cite research about something I am refuting (no evidence of). If there is no proof that a person who is suicidal "will kill himself over someone telling him his work is ****" then how am I supposed to submit it.
Maybe you should cite the evidence where suicidal people
have killed themselves because someone told them their work was ****.