It seems as though a large group of people like yandere girls in their doujins/animes. In case you didn't know, yandere is:
a Japanese term for a person who is initially very loving and gentle, then at one point becomes deranged or psychotic, often brutally so.
It is generally accepted for the girl in a relationship to be Yandere, however, when the guy has those traits, it is looked down upon.
I would like your opinion on why that is.