The Spin - though I understand where you're coming from in saying that because of the actions he's taken your memory of him is tarnished, you should try to empathise (even if its only for a second), no matter how hard it may seem.
Although it may have been building for as long time the final act would have been a very quick and violent outburst and not the act of sane and rational person. There were more than likely numerous contributing factors such as work load, stress, marital\money\drug problems and anything else that you could care to mention, he may even of been suffering from the effects of 20 years of wrestling.
This is not to condone what he did but to say that in cases like this there are often very complex reasons for the outcome and though they may seen insane to us, the thoughts that were possibly running through Benoit's head as he committed the acts and took his own life probably seemed like a moment of clarity in an otherwise confusing world.