According to John P. Jackson Jr., the concept developed in the late 19th century in German Jewish discourse as "a response of German Jews to popular anti-Semitism that primarily was directed at Eastern European Jews." For German Jews, the Eastern European Jew became the "bad Jew". According to Sander Gilman, the concept of the "self-hating Jew" developed from a merger of the image of the "mad Jew" and the "self-critical Jew", and was developed to counter suggestions that an alleged Jewish stereotype of mental illness was due to inbreeding. "Within the logic of the concept, those who accuse others of being self-hating Jews may themselves be self-hating Jews." Gilman says "the ubiquitousness of self-hatred cannot be denied. And it has shaped the self-awareness of those treated as different perhaps more than they themselves have been aware."