Hahaha, I can see why personality cult leaders love telling their students stories like the one you mentioned.
Just believe hard enough. And when you fail to realize your goal, blame yourself and believe harder because I'm infallible.
Yes, Vajrayana is a faith based practice according to Konchog1: the teachings and practice don't matter. Just accept Buddha into your heart.
Such Enlightened Gurus give valuable teachings. Thoroughly inspect your Gurus before learning from them. Contrast to the good Gurus so we understand and value virtuous qualities. Follow Tsongkhapa's directive (see below) to always compare your Guru's teachings to the Dharma, and if there is a conflict, then to ignore your Guru. Pay more attention to qualities and not charisma. etc.
If your Guru steals for example, it's an act. A play. A game. So you must act your part and play along by reporting him to the police.
Question: We must practice in accordance with the gurus' words. Then what if we rely on the gurus and they lead us to an incorrect path or employ us in activities that are contrary to the three vows? Should we do what they say?
Reply: What respect to this, Gunaprabha's Sutra on the Discipline states, "If the abbot instructs you to do what is not in accord with the teachings, refuse." Also, the Cloud of Jewels Sutra says, "With respect to virtue act in accord with the gurus' words, but do not act in accord with the gurus' words with respect to nonvirtue." Therefore, you must not listen to nonvirtuous instructions. The twelfth birth story clearly gives the meaning of not engaging in what is improper.
-Lam Rim Chen Mo eng v01 pg. 86 tib 48
The twelfth birth story is a recounting of the Buddha of a previous life when he was doing Hindu practices. He was a Brahman and he and his follow disciples were told by their Guru to steal. The Buddha alone refused, stating that the teachings say stealing is wrong. His Guru said: "I said this in order to test you all. He is the one who has actually understood my teaching. He has not been led foolishly anywhere like a rivulet of water, but has examined what his teacher has said, and made his own determination.
He is the best among my students."