I can think of better ways to break a chain. Like maybe he could use his head. The other one. Think he'd try it if someone handed him a saw that would actually start ?
You can't fix STUPID! This is an example of natures way of limiting the reproduction cycle of mentally challenged individuals.
And to think... I always thought that is the way you were supposed to start one of those things. But first give it a shot of starter fluid to make sure it will start fast...