Imma have to say no on this one, solely because it had a good outcome. If not for the slave trade, Africans wouldn’t have been brought to the Americas. Good people I know would currently be living in Africa, under god-awful conditions in every way possible. Don’t get me wrong slavery is a horrible thing, but I think the worst human atrocity was the extermination of Jews in Nazi occupied Europe. This is the worst crime because nothing good became of it, millions died horrible deaths, and after it was all over, German was split into a communist half and a capitalist half. To recap, holocaust was worse because nothing good became of it.