In the late 1970s LRH discovered that early knowledge concerning the mind was misused to implant beings with "false" purposes and even evil intentions that were not really of their own origination. The above was accomplished in various ways, but the basic mechanics are always the same. A state of confusion was created and then the individual is handled the false purpose as something to hold onto amid the chaos. Not really understanding how he was being taken advantage of, this trick can result in a being "hanging onto" a destructive desire over long periods of time, causing great difficulty to himself and others. The False Purpose Rundown clears all this up by finding the purpose, tracing it back to its prior confusion and then taking steps to discharge it. The gains are enormous since one is being freed from destructive impulses which have dogged his existence.
This mechanism of creating a confusion to gain the acceptance of a destructive impulse or false information is still in use by psychopaths, sociopaths and anti-social personalities. It comes naturally to them. It behooves anyone to do this rundown as they will get first hand experience on how the mechanism works and be better able to recognize it in the future and avoid it's pitfalls.