[Boo Radley]

Ah, yes. That's the one. My mistake.

Something Aganzir said, I wanted to touch upon; the fate of Saruman. What finally happened to him didn't bother me at all, and as far as I'm concerned he got what was coming to him.
By his actions, he gave up the right for a "noble death" and by being stabbed in the back by Wormtongue (just as he had stabbed everyone in the back whom he had dealt with before), it proved to be a classic example of "what goes round...".
In a literary sense, what he did to the Shire had to be done to show that even someplace as safe and idyllic as the Shire wasn't immune to what had happened in the great wide world. And it was the final tempering for the Hobbits of the Fellowship.