BBC:The death of Muammar Gaddafi has removed a big problem for this country’s transition rulers. It has also imbued the new Libya with original sin it may regret.The leaders of the National Transitional Council (NTC) during the months of the fight against the colonel often spoke about building a country based on rights, not revenge.But the iconic image of their moment of national liberation is of Col Gaddafi, a man who spilled oceans of other peoples’ blood, not accounting for his crimes in a court, but being set upon by fighters who killed him.One man here in Tripoli told me he thought Col Gaddafi should have been spared to make him face justice.   But if the new Libya is going to be a country of rights, then it has some questions to answer.The most pressing are about what appears to have been the summary executions of Col Gaddafi and his son Mutassim.But black Africans have also been rounded up as alleged mercenaries, on little or no evidence, without being given access to a lawyer.I saw several dozen of them today being driven through Tripoli, hands bound, blindfolded with cloths of Gaddafi green, in the back of trucks with welded-on anti-aircraft cannon and heavy machine guns