In Eastern spirituality, guru and Self are said to be one and the same. Surrendering the ego to the guru is surrendering it to one's own true Self. But the guru has to be a Satguru (true master) like the Buddha himself. To surrender to a false guru is disastrous.
A much debated point is whether the Tibetan Government-In-Exile leader the Dalai Lama XIV has met, endorsed or supported Asahara and Aum Shinrikyo. He did meet Asahara; he doesn't deny this, and there are photos to prove it. His inner circle members supported Aum Shinrikyo during the time when the group struggled to obtain the legal religious organization status. The Dalai Lama at least admitted that this error offered proof that he was not a “living Buddha” but it's a shame he neglected to tell us all that before making the error.
Of course, the individual is free to try to overcome desires and attachments and so on, but from an objective point of view it seems extremely dangerous to allow another, a guru, to take control of your own ego. Are there still many believers or ex-believers who don't recognize this?
I don't think many have thought about it properly. Gautama Buddha said: "The Self is the true master of the Self" and "Keep the Self an island, approaching nothing." In other words, Buddhist disciples practice asceticism in order to find the true Self. They find impurities and attachments, and attempt to extinguish these. But what Mr. Matsumoto (Asahara) did was equate "Self" and "attachments." He said that in order to get rid of the ego, the Self must be disposed of as well. Humans love the "Self," so they suffer, and if the "Self" can be discarded then a shining true Self will emerge. But this is a complete reversal of Buddhist teachings. The Self is what should be discovered, not discarded. Terrorist crimes like the gas attack result from the process of easily giving up on the Self. If the Self is lost, then people will become completely insensitive to murder and terrorism.
In the final analysis, Aum created people who had discarded their Selves and just followed orders. Therefore enlightened practitioners in Aum, those most steeped in Aum doctrine, are not truly enlightened people who have mastered the truth. It's a perversion for believers who supposedly have renounced the world to run around collecting donations in the name of "salvation."
The Tokyo Gas Attack and the Japanese Psyche (interview with members of Aum Shinrikyo)