If mentally ill people are the only ones who murder, then what you are saying is all criminals who murder are mentally ill and shouldn't kill.
If you kill someone, you're mentally ill - either long term or temporarily. Period. From your response, I have to ask if you're contemplating murdering someone? What is it in your life that and what you've been through that would make you imply you have murder in your future? Because if you don't have plans for that in your future then I wasn't talking about you, was I? So, if the shoe fits, wear it.
I have and would kill again if my life depends on it. Have you? Combat? Been accosted and defended yourself? You would rather die than to kill to save your own ass?
I wear my shoes and skin both nobly and proud!! Have NEVER done anything that I was ashamed of!! Just what I had to do to survive.
I live by Be Prepared--Adapt--Overcome. Your thoughts on murder come from the Bible and Jesus wasn't even perfect and we all know that.