Zimbabwe and, is there such a thing as ethical assasination?

Here's the latest Zimbabwe craziness.

I typically don't support assasination, and it appears many other don't either. But the case of Zimbabwe is problematic. Take one person's comment:

" I would support the trial of Robert Mugabe, and a free and fair election...."

The problem is that neither is possible in a country as corrupt as Zimbabwe. Mugabe and his thugs are killing thousands and will continue to do so. The rest of the world is in the grips of recession and isn't focused on the Zimbabwe issue. What hopes do these starving and dying people have?