I think Mugabe is a product of his environment.
Africa is a continent where democracies are a minority - most leaders seize, and maintain power by force.
Mugabe has spent his life getting, and keeping the power he has, unchecked by anyone who can actually do anything.
When you have that level of mental tenacity, the hand-wringing of the rest of the world must sound like white noise (pun intended!) on a radio in the next room.
Britain registers its disapproval of him by withdrawing his knighthood! Wow, I bet he cried himself to sleep that night!
Mugabe will die as he has lived, in power, no matter what anyone thinks or says.
It's not complicated is it?