Spirituality in itself is neither good nor bad but just speaks of another level of reality that underlies our own here. So if Heinrich Himmler took an interest in the occult, it could have led him to do evil things because he felt as if he were above others or that he had freedom to do in this life what he wanted to do.
As Adolf Hitler's interior minister in the Nazi Party, Heinrich Himmler was just as evil and sadistic as Hitler himself. Himmler was directly responsible for the Holocaust. His interest in the occult started at a young age and many occult symbols became known through displays of the Third Reich. Surely many of the ghastly experiments done on prisoners were due to Himmler's interest in ancient barbaric practices of occult religions.
Heinrich Himmler was known to have been interested in occult and obscure philosophies and it is clear that they influenced his political attitudes. He was certainly not a mainstream thinker, and today his ideas are considered contrary to human nature. His deeds are notorius, and it is important to understand what would cause someone to act in this way.
I think that Heinrich Himmler's interest in the occult influenced his political views, because it had to take some strange political views in order to justify all of the terrible things that were done in Nazi Germany. Himmler had to find a way to justify killing millions of people, and the occult was a major interest of his.
Heinrich Himmler was raised as a devout Catholic, and throughout his University days he remained a Catholic and had not yet fully embraced his anti Semitic views. However some time during his scholastic years he became interested in the "Jewish Question" and his political Ideas became aligned with the far right. After Joining the Nazi Party, Heinrich HImmler gravitated from his Roman Catholic upbringing, towards a following of the occult and German mythology. The beliefs that radiated from the occult religion justified the German persecution of the Jews and therefore strengthened his far right political views. The Occult allowed Himmler to rationalize his political views and practices.