The concept of "psychopathic inferiorities" had been recently popularised in Germany by Julius Ludwig August Koch, who proposed congenital and acquired types. Kraepelin had no evidence or explanation suggesting a congenital cause, and his assumption therefore appears to have been simple "biologism". Others, such as Gustav Aschaffenburg, argued for a varying combination of causes. Kraepelin's assumption of a moral defect rather than a positive drive towards crime has also been questioned, as it implies that the moral sense is somehow inborn and unvarying, yet it was known to vary by time and place, and Kraepelin never considered that the moral sense might just be different.
The concept of "psychopathic inferiorities" had been recently popularised in Germany by Julius Ludwig August Koch, who proposed congenital and acquired types. Kraepelin had no evidence or explanation suggesting a congenital cause, and his assumption therefore appears to have been simple "biologism". Others, such as Gustav Aschaffenburg, argued for a varying combination of causes. Kraepelin's assumption of a moral defect rather than a positive drive towards crime has also been questioned, as it implies that the moral sense is somehow inborn and unvarying, yet it was known to vary by time and place, and Kraepelin never considered that the moral sense might just be different.