摘要：The incidents in Cologne at the New Year´s Eve with sexual attacks against young women performed by some hundreds of Arabian refugees and migrants have originated a debate both about the causes to such strange forms of behavior and about migration policy. Most experts earmark either the specific social situation of migrants or their traditional values regarding gender relations as causers to these forms of delinquency. The article shows that explanations of this type are not sufficient to explain such extreme forms of behavior unknown in the crime history of Germany. It is evidenced that instead only developmental psychology is able to explain these crude and brutal patterns of behavior. Different nations stay on different stages of psychological development, as Piagetian cross-cultural psychology found out. Therefore, it will need generations to raise in the new migrants those higher stages that carry a civilized conduct peoples of the most advanced nations of today usually exhibit. The incidents of Cologne shed a light on the modifications of culture modern societies have to face when they follow the migration policy Germany currently practices for whichever reasons. The new approach shows a fundamental theoretical alternative both to social psychological and racial-biological theories regarding the scrutiny of the psychology of different nations and of the problems of migration policy.
