Humanicide
The inevitable extinction of humanity because of human nature. Originally used by the sludge band, Dystopia, in the song "Hands that Mold".
Humanicide brought by by nuclear warfare, natural disasters due to environmental abuse, or other man-made issues.
Humanicide
The taking of life of a mass group of individuals, known or unknown, with the intention of taking ones own life as well.
The shooter in the October 2017 , killings in Vegas was clearly on a mission to commit humanicide.