The enemy always promotes these "prophets" and "prophecies" to convince the masses that the bullshit they would love to manifest is something that is set in stone, something that is inevitable and already written.
Then the "believers" are completely convinced that all of this is true, and by doing this they are subconsciously giving a lot of psychic energy to these "prophecies" and they actually come true sometimes.
People who have experience with Magick and manifesting events are very familiar with the principles behind this process.
All of this works also on the psychological level as well, meaning that if one is convinced that an event is inevitable, he will be extremely discouraged and he won't do anything to prevent it.
About prophecies of our side, recently I discovered something about the God Thoth, He basically predicted thousands of years ago that this world would see a very dark era, where very evil and unjust men would be in positions of power.
Asmodeus also said that all of this will only last a season (in Gods' terms), and the enemy will lose all influence after that.
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Hitler doesn't even fit that description, because his mission was political, not religious. He rarely spoke about religion publicly, he just worked to free the Germans of Yehuborim control, transformed German economy, arrested the Rothschilds, and many other positive things that are barely mentioned by anyone who speaks about him.
Hitler's mission was just as much spiritual as it was political. He was surrounded by people who were adept in the occult, as he was himself. They did many spiritual things to ensure the success of the material political side.
Politics will never succeed, without the spiritual.