Himmler was disconnected from the people around him

Heinrich Himmler experienced several setbacks in life that rocked his worldview.

First, while Himmler was still in training in November 1918, when Germany was defeated, the war came to an end, depriving him of the chance to serve as an officer or in battle. After being released on December 18th, he went back to Landshut. Himmler finished grammar school following the war.

His political beliefs shifted to the extreme right after the 24 June murder of Foreign Minister Walther Rathenau, and he joined protests against the Treaty of Versailles. His parents could no longer afford to send all three of their sons to school due to the rampant hyperinflation. He was obliged to take a low-paying office job after receiving his agriculture diploma because he was dissatisfied with his inability to pursue a career in the military and his parents' inability to pay for his doctoral studies.

Second, Himmler lost his job as a result of the failure of Adolf Hitler and the Nazi Party's effort to overthrow the government in the Munich Beer Hall Putsch. Nobody is interested in hiring him as an agronomic because of his role in Nazi agitation. He was forced to return to living with his parents as a result.

These things eventually made Himmler alter. He turned aggressive and irritable. He became estranged from both his buddies and his family as a result.