Not sure that I get it. If you were a person that advocated for human extinction, shouldn't you just start with yourself?
I'm really not making personal jibes here. Or saying that anyone should off themselves. But, if you identify a problem with humanity, isn't the first order of business to change yourself before trying to change others? If you are an alcoholic, and want to combat alcoholism in humanity, isn't getting off the sauce yourself the smart thing to do first?