@campaign of hate, they threaten teenagers thinking of leaving in a similar manner - 'if you leave, you'll become addicted to X, or you'll sleep around and get STD/unwanted pregnancy, or get in trouble with the law or ... etc.'
As you've pointed out, it can become a self-fulfilling prophecy, especially to teenagers.
It's almost as if the WTS wants leavers to fail so that they return to the religion.