As for "little is gained" -- do not think that homicidal tinpot dictators do not look at Hussein's fate and shudder. They've just found out that, if deposed, they are not guaranteed final years of luxurious living abroad. Now, they know, there are forces at large who want them to face death before the very people whom they had terrorized and beaten down. This is not the end desired by men for whom dominion over others trumped all.
If this execution were the martyr's end he sought, Hussein would not have greeted U.S. troops who found him in a hole in the ground three years ago with these words: "I am Saddam Hussein, president of Iraq. I want to negotiate."