Atlantis developed an incredibly high level of technology and knowledge. Unfortunately, they (we) did not develop a high level of ethics and morality to go with it. Ultimately, they (we) ended up destroying themselves (ourselves) with their (our) own technology.
Through greed and the black arts, crystal/ atomic/ whatever explosions caused the destruction of the world as it was through the separation of the water in the atmosphere. This created "The Flood" - massive chain reactions that caused the atmosphere to change drastically. In Atlantis (the Earth Epoch) the atmosphere of the earth was saturated with water. Understanding this would explain at least several of the archeological mysteries that exist.
Human beings had differently organized bodies, not as "hard" as they are today. We breathed differently. This is why yoga breathing developed, to teach those who were destined to survive how to use their lungs to breath the air that we know today. Manu (Noah) was the leader of the positive stream of humanity that was destined to survive the coming catastrophe by migrating to the East (India). According to Rudolf Steiner, there were two negative occult streams who prepared and also survived by migrating to the West. (North and South America).
These were not meant to survive and were not divinely guided, but obtained their prophetic knowledge through the black arts.
The collapse of Atlantis (both the continent and civilization) plunged humanity into a much more "primitive" state of existence. Gone were the fabulous technologies. Live on Earth became harder and more basically survival oriented. Knowledge was retained by the Initiated but not widely disseminated. Ancient India and Ancient Egypt were able to retain some of the technological knowledge as an ever dimming memory. But it faded with the ages until the masses of humanity were living in the Dark Ages.
Along with the loss of scientific or Earthly knowledge and development came the loss of spiritual or Cosmic knowledge and development. Without the intervention of The Christ, no renewal of connection with the Divine would have been possible for Mankind.
As Humanity began its climb back up to higher stages of knowledge, the negative forces took hold once again, encouraging the growth of greed and destructive knowledge through technology. We have now come back again to a state similar to the pinnacle of Atlantean culture. And we are repeating our former mistakes, amplified. There is no water atmosphere to cushion the blow to the planet this time. As was foretold, it is the Fire this time.
As long as human technology was used to create Death, it could actually be tolerated. Humans have killed each other since the beginning, starting with Cain and Abel. Although these deeds have always been terrible, the nature of murder can be overcome in time through karmic reparation. But when humans "play God" and try to create and genetically manipulate Life, we are crossing an ethical line that cannot be tolerated. No matter how much the propaganda says that it is for medicine and the good of humanity, it is really the greatest expression of the Dark Arts - the Frankenstein Syndrome.
Almost all of the technology in existence today has been inspired and encouraged by Ahriman himself. While much of it can be used for either good or evil, without concurrent development of spiritual ethics and love, it will be and is being used for evil. Death, even massive amounts of death is not really something to be afraid of. We can leave this Earth in many, many ways and return again to continue what we were working on inwardly and outwardly. But when technology has developed in such a way that it threatens to make the Earth no longer a vessel for Life, we have reached a critical point. The almost incomprehensible reality that we can create and are in the process of creating a situation where healthy life on Earth is no longer possible is the ultimate horror.
If the only way to stop this from happening is to destroy this civilization and plunge the surviving remnants of humanity back into the stage of technological ignorance, then bring it on. Better a return to genuine, if primitive, Life than a genetically mutated horrific imitation.