This too is not good sense. One can explain it by a yearning for events by havingness and other ways, but these do not factually lead to a total solution. The real reason stems from a characteristic of a thetan. He never totally gives up. There is, seemingly, a streak of resistance or resentment that makes a thetan wish to persist in the same place.
All power comes from the ability to occupy a point.
The base that separates two terminals must be firm or there will be no exchange of energy. The effort to weaken a thetan is to make him relinquish his point in space. Covertly or overtly a thetan seeks to assert his position in space. If he cannot do so overtly he does so covertly. He also mocks up the events of his departure as a part of the action of mocking up the point he is leaving.