Who can know for sure, but my guess, from his apprearance on the Larry King Show, was hatred and revenge against the Schiavo family.
Did you ever watch the move "The Godfather"? The scene with the horse head? Along those lines.
Some people with a certain mind set, hate other people so badly, that they are willing to kill the people closest to their enemy's hearts.
I know a woman whose ex husband was so angry with her, he took his two beautiful little boys out and shot them....just to hurt her.
Another sad story...
You know, this is just one of those days where you sigh and say, "Please come quickly, Lord".