The end was said to be ruthless. Thousands of civilians were cornered by the Government troops or held captive by the Tigers for use as human shields, depending on which side was telling the story. The Government permitted no independent news coverage. Tamils living in other countries, including New Zealand, appealed to the international community fearing a massacre was imminent.
No intervention came. The Government forces triumphed, the rebels were routed and 40,000 civilians are said to have died. The United Nations called for an independent inquiry into the events of the final weeks but the Government has refused to allow it. When a long civil war ends in a clear, if brutal, victory for one side, it behoves the victors to take steps to repair the wounds. This appears not be happening. Mr Rajapaksa's Sinhalese Government is said to have made no effort since 2009 to reconcile the Tamil minority.
Civil rights appear to be deteriorating again. Some reports say hundreds of people have disappeared, journalists are being threatened for doing their job, union leaders and civil libertarians work under warnings and sometimes are roughed up. The Chief Justice has been dismissed for trying to uphold the rule of law.
The question, of course, is whether all of this is enough to warrant a boycott by Commonwealth leaders. A boycott is the Commonwealth's best weapon short of expulsion for upholding the principles in its charter: democracy, human rights, tolerance, freedom of religion and speech, and the rule of law. The Rajapaksa Government appears to be violating them all except democracy, winning elections with ease among conservative rural Sinhalese.
The Commonwealth needs to use its best weapon carefully. A concerted boycott at this stage would be premature. The absence of Canada's Stephen Harper and India's Manmohan Singh speaks loudly enough for now. It is up to those who attend the Chogm to use the occasion effectively. Their host should be left in no doubt that attendance is not approval and all the Commonwealth's principles count.