There is an assumption, in attaching Puritan concepts such as 'successful' and 'unsuccessful' to the awful, final act of suicide, that those who 'fail' at killing themselves not only are weak, but incompetent, incapable even of getting their dying quite right.
Kay Redfield Jamison (2014). “An Unquiet Mind: A memoir of moods and madness”, p.72, Pan Macmillan