If you consider killing as a valid option from a philosophical point of view
ignoring affect-doings caused by emotional trauma like seeing your gf getting fuggt by someone else, the only next logical step is that genocide is superior to single killings, since nobody is left who might say something against your killing.
If you start to genocide, the best option is to kill everyone and do not discriminate between child/woman/man/religion/whatev. Instead, you should genocide everyone.
Therefor:
If you consider killing as a valid option, start with yourself.
quod erat demonstrandum
>>9144because humans are stupid and cannot think logically.
additional the human is an emotional being. sometimes he doesn't care about logic, because of current feelings like the previous mentioned example of your gf getting fuggt by someone else.