There were several reasons why Hitler had German children join Nazi organizations, but perhaps the greatest was that he wanted to engrain them with propaganda from the earliest possible age so it stuck with them.
Step-by-step explanation:
Hitler had German kids be a part of Nazi organizations so from a young age they'd be concerned within the system. From the beginning, they'd be trained to try to to terrible things. They'd nonetheless to become conscious of the horrors being caused, and by the time it came to adapt opinions, it had been too late.