You think you can refute the man's extended and well documented tyranny to one case?
Well, sure. Joseph Stalin was once rumored to have murdered his wife. She actually committed suicide, so he wasn't really responsible for her death. That bad thing that was said about him wasn't true, so none of the bad things said about him were true. Ergo, Stalin was really a nice guy. See how easy that was?
You really need to get back to some basic American history, Professor, with a quick refresher course in 16th century European city/state development.