I agree with most of what has been said so far and have some things to add.
All JWs are programed with a self destruct program if they ever leave the organization.
We came from a destructive and abusive belief system based on guilt and fear.
We were all taught that the world (that is anyone who is not a JW)is imoral and under Satans power.We are taught if we ever leave we will become wicked,imoral and under Satan's influence just like they are.
Many still hang on to these old beliefs even if only subconsciencly sometimes after leaving the JW life.
If we leave believing they are right about this then we become self fulfilling prophecies.
Then we also have the power of our anger and rebellion against almost every thing to do with JWs once we realize how mislead we were.We are in pain over the loss of family and friends. Sometimes we have no where to put this anger so it comes out in a selfdestructive way.
I do not think going wild temporaraly has anything to do with whether you believe in God and the Bible.Christians act out this way too, so don't try to say it is because of Athiest or Agnostic beliefs that this happens.I know Athiest and Agnostics with the highest of morals.
So in summary, my theory is that self destructive beliefs,anger, rebellion,loss also play a part in this.
ChiChi