Why do you think Hitler had German children join Nazi organizations?

Hitler and other leading Nazis quite intentionally established Nazi organizations for young Germans as well as adults for the sake of solidifying their rule in the present and in the future. By training German children in Nazi values, doctrines, and practices, the Nazis knowingly laid the groundwork for a more loyal and obedient next-generation of Germans who would preserve (and perhaps even expand) the accomplishments of Hitler and the present generation of Germans.