In his comments on Wednesday, Blair accused Mugabe of acting like a dictator and said Britain would push for action against him at a Commonwealth summit this weekend. [Excerpt]
He isn't acting.
Venezuela at least has some history of half-way reasonable self-rule by the people there since they attained independence from Spain in 1830. Yes, they've had periods of military dictatorship, but the people have mostly managed to keep themselves fed, and you don't hear of mass starvation (like Somalia, Nigeria (Biafran Independence attempt), and Ethiopia) or episodes of mass killing (Rwandan massacres)
Their current situation is caused by a raving Marxist having been installed thru his having the most votes in a three-way race (something like how we got Clinton in his first term)