A typical approach to demonic possession
 
 
"If, as the result of certain teachings  having been imparted to him without  the requisite caution   [preparation] a  man comes into contact with certain    destructive beings behind the veil of  nature [i.e. the   "veil" is what we  consider to be the material world],  he   will become one who VALUES NOTHING IN THE WORLD,  and  it will soon be apparent  that he TAKES ACTUAL PLEASURE  IN DESTRUCTION - which need not necessarily   be  destruction of external things.  Many  men to  whom this  has happened have  shown that they TAKE PLEASURE IN  TORMENTING AND OPPRESSING OTHER SOULS.    These are  the characteristics which  come into  evidence.  But it can  never  be said that men who  have such traits  owing to  their alliance with Ahrimanc [Satanic] elementary beings,  are  invariably egotistic.   They need not, and  usually are  not, egotists.  They  act out  of an urge quite different  from that of egotism.  THEY ACT OUT OF A LUST FOR  DESTRUCTION, and  they destroy without  the slightest  benefit accruing to   themselves.  The beings into whose   sphere a man  enters are essentially  beings of destruction,  and the  tempt  him, lure him, to destroy." [1] 
                    
The region of destructive spirits into  which a man  may  come is disclosed  most clearly of all if a soul is  observed   at the moment of passing through the  gate  of death.   Then these spiritual  beings swirl forward in  their hosts;  nor  is this surprising, for they are the  spirits of  destruction.  To work at the  destruction of  the physical  organism is  their regular function. [2] 

The region of Scylla is that of the spirits  who serve   Ahriman.  WE COME INTO THEIR SPHERE IF WE CULTIVATE,  NOT EGOTISM, BUT THE WILL FOR DESTRUCTION. [3]

For example, there actually exists in the  world an  [occult]  Order which leads men to knowledge of  these mysterious  beings  without any preparation.  In  all such  men,  instincts of destruction are aroused, so  that this order is  actually  responsible for sending  human beings  with  destructive instincts out into the world.   [4]
 
Lucifer, however, incites his fiery spirits of will to take certain forces out of us in order to make these forces independent.  And so if we cross the  Threshold in  the direction of Lucifer's realm [i.e. toward  mysticism] and come  back into the  body, we feel as  if certain  parts are hollow, as if  something has  been taken out of us.  Ahriman ADDS   something, because  as he enters into us  he fills the  organs.  Lucifer  TAKES AWAY  organs, makes what was  otherwise  part  of our own organism, independent of us."  [emphasis added] [5]

There are a couple of points in the  above quotation  which  I would like to emphasize.  One is that once a  person   crosses the Threshold without  undergoing  the arduous  preparation  required to do so safely  (which not  everyone  can do in their current  incarnation, for various reasons),  they  become  possessed, and even when the  process  which  allowed them to become possessed ceases, they  are  still  possessed BUT THEY DON'T KNOW IT,  although they  feel different.  They  become a  different class of being,  which  is controlled from  below like a puppet  by beings  whose purpose is to  destroy.

As the twig is bent, so grows the tree

Many aspects of pop "culture"  are apparently intended to  gradually transform the  minds of  impressionable  youngsters so  that they become  open to they types of   activities leading to  possession.  Essentially, anything  which tends to cultivate either a neutral or positive attitude toward inflicting injury or suffering on humans or animals falls into this category.   Note, for example, the connection between video  games  which simulate killing and violent behavior in the real  world.  The literature of the organizations which produce  some of these games is riddled with Satanic overtones. 

 
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References
 
[1] Rudolf Steiner: The Occult Movement in the 19th Century, p 161
[2] ibid. p 180
[3] ibid. p 164
[4] ibid. p 157
[5] ibid. p 187