Should the father/daughter incest couple be sterilized?

As if the news from the polygamy ranch in Texas isn't bad enough, there's another mind blowingly disturbing tale making the rounds today: An Australian couple, who recently gave birth to a baby daughter, are also father and daughter. A judge separated John, 61, and Jenny Deaves, 39, on incest charges, but currently, they're simply "being monitored." According to a report this morning in the Australian Broadcasting System, a high profile child advocate, Professor Freda Briggs of the University of South Australia, claims the couple should be sterilized to prevent them from bearing more children.

What do you think about this mess?