That's great...unless you happen to the guy!
The very point of the exercise is to prevent the murder, while letting the world know the truth.
The world knows Saddam has threatened to kill the guy. Guy is killed. World knows Saddam did it. World opinion swings against Saddam.
Remember that dictators like Saddam survive on "world opinion." That's why they hire media whores to influence "world opinion" in their favor. If "world opinion" turns against them, they're toast.
You're just wrong. No way world opinion would have saved that guy. Saddam killed his own son-in-law after inviting him back--EVERYBODY knew about that one, but it didn't stop him from doing it.