I don't agree with how some of the country makes the person in the home "liable" for being burgled.

But on the flip side, I think the pendulum swung too far to the other side on this case.
Shooting two people in the back fleeing the scene? That's not self-defense.

From another article:

The operator repeatedly told Mr. Horn not to shoot, and the police had just arrived at the scene when Mr. Horn fired three blasts of 00 buckshot from his 12-gauge, striking the men in their backs.

http://www.nytimes.com/2008/07/01/us.../Yz8p9F7kGr6yQ

The police "had just arrived", the men were fleeing with their backs to the shooter, and Mr. Horn feared for his life???