The world seems to be forgetting that Mugabe is in his mid 80s. There is a high probability that he has some form of dementia and is no longer wholly responsible for his actions. Mugabe was once a hero but lost the plot over the years but really - how many of us would be happy with our Grandfather (however loved) in charge of a country?
The bigger villains today are the ones who work hard to keep him in power for their own reasons, which are probably driven by the usual motive of greed.

He needs to be retired, with extreme prejudice if necessary, as soon as possible.