It is really hard to wrap your mind around.
But think of this woman, (and Ted Haggard and Larry Craig and all of those other high profile good Christians who were holier than thou when it comes to sex) the next time you hear someone say, "But if we allow gay marriage, then EVERYONE will do it."
The thing is, somewhere in their twisted minds, they KNOW they are "sexual sinners," but somehow believe that the laws keep them reined in. And they fear that they will always be pushing the limits. If they do these really evil things that are not allowed, imagine the levels they would go to if the bars were raised.
Of course, what this woman did to her poor daughter is so much worse than taking an escort along on a business trip, or getting an anonymous blow job in a public bathroom. She abused and damaged her little girl. The child that she was supposed to be protecting and nurturing and educating. I cannot begin to understand the events in her life, or her thought process as she progressed towards this unspeakable abuse. She is clearly a very damaged person. A very dangerous person.
This is a tragic story.