Even though Hitler did not win the WW2, he had a lot of help from Hitler Youth (HJ).
Hitler youth gained massive support from the future generation and the PARENTS. Propaganda poster made Hitler youth look fun ( which it actually was) and also taught kids on how to behave.
Hitler was thinking long-term as he was using HJ to indoctrinate (brain-wash) the youth so they will support him in the future. However, since Hitler lost the war, HJ was abolished. Hitler gained over a MILLION support from HJ.
This gave Hitler the confident invade other countries and break the treaty of Versailles's law.