Because Hitler knew that if he had the minds of the newer generations under his control, there would be little chance of his being overthrown by his own people.
Hope that helped =)
A·loof
əˈlo͞of/
adjective
not friendly or forthcoming; cool and distant.
"they were courteous but faintly aloof"
synonyms:distant, detached, unfriendly, antisocial,unsociable, avoidant, remote, unapproachable,formal, stiff, withdrawn, reserved, unforthcoming,uncommunicative, unsympathetic;
informalstandoffish
"part of their strategy is to remain aloof during the first stages of negotiation"
conspicuously uninvolved and uninterested, typically through distaste.
"he stayed aloof from the bickering"