Who Really Murdered the Seven Jews in Jerusalem?

Is the Arab terrorist alone to be blamed for the deaths of the seven Jews on Friday? If you let a child molester sleep in your home, should you be surprised if you wake up to discover that your child is molested? And if, after your child was molested, you're crazy enough to continue to let the molester sleep in your home, who's really to blame if your child is molested again – you or the molester?