Mr Cameron has not been back to Benghazi, nor is he likely to do so as warring militias reduce Libya to primal anarchy in which nobody is safe. The majority of Libyans are demonstrably worse off today than they were under Gaddafi, notwithstanding his personality cult and authoritarian rule. The slaughter is getting worse by the month and is engulfing the entire country.
"Your friends in Britain and France will stand with you as you build your democracy," pledged Mr Cameron to the people of Benghazi. Three years later, they are words he evidently wants to forget, since there was almost no reference to Libya, the one military intervention he had previously ordered, when he spoke in the House of Commons justifying British airstrikes against Islamic State (Isis) in Iraq.
The foreign media has largely ceased to cover Libya because it rightly believes it is too dangerous for journalists to go there. Yet I remember a moment in the early summer of 2011 in the frontline south of Benghazi when there were more reporters and camera crews present than there were rebel militiamen. Cameramen used to ask fellow foreign journalists to move aside when they were filming so that this did not become too apparent. In reality, Gaddafi's overthrow was very much Nato's doing, with Libyan militiamen mopping up.
Human rights organisations have had a much better record in Libya than the media since the start of the uprising in 2011. They discovered that there was no evidence for several highly publicised atrocities supposedly carried out by Gaddafi's forces that were used to fuel popular support for the air war in the US, Britain, France and elsewhere. These included the story of the mass rape of women by Gaddafi's troops that Amnesty International exposed as being without foundation. The uniformed bodies of government soldiers were described by rebel spokesmen as being men shot because they were about to defect to the opposition. Video film showed the soldiers still alive as rebel prisoners so it must have been the rebels who had executed them and put the blame on the government.
Foreign governments and media alike have good reason to forget what they said and did in Libya in 2011, because the aftermath of the overthrow of Gaddafi has been so appalling. The extent of the calamity is made clear by two reports on the present state of the country, one by Amnesty International called "Libya: Rule of the gun – abductions, torture and other militia abuses in western Libya" and a second by Human Rights Watch, focusing on the east of the country, called "Libya: Assassinations May Be Crimes Against Humanity".
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The latter is a gruesome but fascinating account of what people in Benghazi call "Black Friday," which occurred on 19 September this year, the most deadly day in a three-day assassination spree in the city, in which "the dead included two young activists, members of the security services, an outspoken cleric and five other civilians". The activists were Tawfiq Bensaud and Sami Elkawafi, two men aged 18 and 19, who had campaigned and demonstrated against militia violence. Among others who died was a prominent cleric, Seikh Nabil Sati, who was murdered, as well as a young man, Abdulrahman al-Mogherbi, who was kidnapped at the cleric's funeral and later found dead.
Their murders brought to 250 the number of victims of politically motivated killings this year in Benghazi and Derna, the major cities in eastern Libya. This is not counting the far larger number who have died in military operations between the different militias or the battles that have raged in and around Tripoli.
Without the rest of the world paying much attention, a civil war has been raging in western Libya since 13 July between the Libya Dawn coalition of militias, originally based in Misrata, and another militia group centred on Zintan. A largely separate civil war between the forces of retired General Khalifa Haftar and the Shura Council of Benghazi Revolutionaries is being fought out in the city. Government has collapsed. Amnesty says that torture has become commonplace with victims being "beaten with plastic tubes, sticks, metal bars or cables, given electric shocks, suspended in stress positions for hours, kept blindfolded and shackled for days."
It is easy enough to deride the neo-imperial posturing of David Cameron and Nicolas Sarkozy, or to describe the abyss into which Libya has fallen since 2011. The people whom that intervention propelled into power have reduced a country that had been peaceful for more than half a century to a level of violence that is beginning to approach that of Syria, Iraq and Afghanistan. Whatever Western intentions, the result has been a disaster. In Libya, as in Syria today, Western intervention was supposedly in support of democracy, but was conducted in alliance with the Sunni absolute monarchies of the Gulf who had no such aims.
The temptation is to say that foreign intervention invariably brings catastrophe to the country intervened in. But this is not quite true: US air strikes in defence of the Syrian Kurds at Kobani and the Iraqi Kurds in their capital Erbil are justifiable and prevent massacres by Isis. But the drawback is that foreign intervention is always in the interests of the country intervening. These may, for a time, coincide with the real interests of the country where the foreign intervention is taking place, but this seldom lasts very long.
This is the lesson of recent foreign interventions in Afghanistan, Iraq, Libya and Syria. Most Afghans wanted the Taliban out in 2001 but they did not want the warlords back, something the Americans found acceptable. The US would fight the Taliban, but not confront the movement's sponsors in Pakistan, thereby dooming Afghanistan to endless war. In Iraq in 2003, many Iraqis welcomed the US-led invasion because they wanted the end of Saddam Hussein's rule, but they did not want a foreign occupation. The Americans did not want the fall of Saddam to benefit Iran, so they needed to occupy the country and install their own nominees in power.
In all three cases cited above, the West intervened in somebody else's civil war and tried to dictate who won. There was a pretence that the Taliban, Saddam, Gaddafi or Assad were demonically evil and without any true supporters. This foreign support may give victory to one party in a civil war, as in Libya, which they could not win by relying on their own strength. In Iraq, the beleaguered Sunni could not fight a US-backed Shia government so it needed to bring in al-Qaeda. Thus the conditions were created that eventually produced Isis.