Hmmm, I agree they did, but they had to in the face of the ICC's failure to act appropriately. My (hazy) memory of the situation was that it was a shambles. I think Wakeyred makes an excellent point in citing South Africa. The success was achieved through a coordinated response.
The thing that bothered me was that South African cricket suffered, the fans suffered while at the same time businesses were making millions through trade deals and many of them a whole lot less ethical than a game of cricket (allegedly). There are ways and means to bring down corrupt and murderous regimes but I find it hard to accept that sporting sanctions are an effective measure.
I do think sport can help these situations but governing bodies should be suspending the country from competitions not setting up individual countries/players to make the political decision. Plus the quote below from the linked artical is where the pressure should be put on the regime and to hold the next meeting in sri lanka is unbelievable! 'When we last saw President Rajapaksa, he was cheerfully greeting the Queen at last year’s Commonwealth Heads of Government Meeting in Australia. He also looked pretty happy that the next conference will be held in Sri Lanka'