Editor's note: Ressa, head of the ABS-CBN News and Current Affairs Group and former CNN Jakarta Bureau Chief, wrote this piece for the blog of the CNN show, AMANPOUR.

You can’t escape the laws of physics. Newton’s third law of motion states: “for every action, there is an equal and opposite reaction.” In the world of governments and their security forces, it’s called blowback – a term first coined by the US Central Intelligence Agency in classified documents to describe US and British covert operations in Iran in 1953. They helped overthrow the government of Mohammed Mossadegh, setting in motion a chain of events which inspired the revival of Islamic fundamentalism around the world.

Blowback happened again in Afghanistan in the late 80’s when the US funneled more than $3 billion, through Pakistan’s intelligence service, ISI, to build up the Afghan resistance against the Soviets. That sowed the seeds for 9/11 and the major terrorist attacks in Southeast Asia from 2001 to 2009. Among the key beneficiaries was Abdul Rasul Sayyaf, who helped train Osama bin Laden and thousands of Southeast Asian militants including the founder of the Abu Sayyaf in the Philippines, some of the Bali and JW Marriott bombers.

Blowback happened in Maguindanao in the southern Philippines – where warlords with private armies funded by the state wield political power.

It’s a complex situation: the power structure of government is a thin overlay on top of a complex social hierarchy based on families or clans. These clans periodically clash – feuds known as rido, which can be ignited by the flimsiest of reasons – a quarrel over women or a verbal slight. Clans became the foundation of electoral politics and determined the distribution of power and resources.

Add the fight against Muslim insurgents, first the MNLF or Moro National Liberation Front. Now it’s the Moro Islamic Liberation Front of MILF, which provided training and sanctuary to numerous Islamic militants, including members of Jemaah Islamiyah, Al-Qaeda’s arm in Southeast Asia.

The Ampatuan family’s rise to power began in the Marcos era, when it closely allied with the military to fight the Moro National Liberation Front or MNLF. When the MNLF signed a peace agreement with the government in 1996, the enemy changed to the MILF, now the largest Muslim insurgency in the country.

In the late 1990’s, Andal Ampatuan, Sr., avowedly anti-MILF, was handpicked by the military to run as governor against a rival who was supportive of the MILF. Ampatuan won in 2001 in an election that was largely seen to have been manipulated by the military. He was described as a “military-sponsored warlord.”

He gained even greater power after he helped Gloria Macapagal- Arroyo win the 2004 presidential elections. She won by such a large margin in his areas of influence, including all the votes in three Maguindanao towns, that her victory became suspicious.

In exchange, the Ampatuan family asked for money, guns and power. In July 2006, President Arroyo overturned a clause in the Philippine Constitution that banned private armies. She issued Executive Order 546 giving local officials and the Philippine National Police or PNP the power to create “force multipliers” in the fight against the MILF. In reality, the Ampatuans converted their private armies to the legal and more elegant euphemism - CVO’s or civilian volunteer organizations.

The military has its own term for members of this private army: Civilian Armed Force Geographical Units or cafgus. These are men who are paid by the local government and trained by the military – all deployed under the command of Ampatuan. Unofficial estimates of the men under Ampatuan’s command reach 800, including cvo’s and cafgus.

Reports of violence, abuses of power, and murder increased through the years, but little was done. People were too afraid to speak. Shortly before the 2001 elections, one of his political rivals was murdered inside a restaurant. Ampatuan was the primary suspect and was even charged, but nothing happened. In another instance, police said the nephew of a rival was killed with a chainsaw. The body was never found. Another rival was burned alive. In every instance, suspicion fell on Ampatuan, who created and exploited a culture of impunity.

This is the story of how the government and its security forces used the Ampatuans and their private armies to fight a proxy war against the MILF, and how it all horrendously backfired. After the main suspect, Andal Ampatuan, Jr., was brought to a Manila jail cell, he protested his innocence. "I didn't do it," he said, "it was the MILF."

Blowback. In biblical terms: “we reap what we sow.”