Book Idea - Horror/Thriller

[maskedmelonpai]

I don't read these sorts books and can't write my own cause i pretty sure it fuck me up thinking about, so gonna post the idea here in case someone else suitably sick wanna run with it.

Ok, so here the idea. there a guy and he liek super smart and bent on the betterment of mankind, but he also have no feeling at all or maybe he do and he just reasoned himself into a bad place. anyway he go on like a crusade to rid the world of evil, but understand evil not so obvious always. it still there even when not apparent. it have a hidden component that only reveal itself unde significant pressure, so he subject pairs of people to zero-sum games of equally abhorrent choices, where he like say to be two people that they must do some awful thing to the other person or he gonna do it to their child (he don't though cause he not a sick bastard like they is). Then when that person do that thing, he kill them for being disgusting human beans and go and hunt down all they family, to rid the world of they evil genes.