It is wicked of you to even suggest that anyone here regarded the massacre as "justified."
You should take that back now Steve.

These events happened in the context of the Lebanes civil war that had been grinding on for years.

"From 1975 to 1990, groups in competing alliances with neighboring countries fought against each other in the Lebanese Civil War. Infighting and massacres between these groups claimed several thousand victims. Examples: the Syrian-backed Karantina massacre (January 1976) by the Kataeb and its allies against Kurds, Syrians and Palestinians in the predominantly Muslim slum district of Beirut; Damour (January 1976) by the PLO against Christian Maronites, including the family and fiancée of the Lebanese Forces intelligence chief Elie Hobeika; and Tel al-Zaatar (August 1976) by Phalangists and their allies against Palestinian refugees living in a camp administered by UNRWA. The total death toll in Lebanon for the whole civil war period was around 150,000 victims"

"During the early years of the war, massacres on a large scale were perpetrated by the fighting forces against the civilian population. The Christian city of Damour was captured and destroyed by Palestinian terrorists in January 1976. The Christian residents fled the city, and the conquering forces carried out acts of slaughter that cost the lives of many Christians. In August 1976, the Christian forces captured the Tel Zaatar refugee camp in Beirut, where Palestinian terrorists had dug in, and thousands of Palestinian refugees were massacred. Each massacre brought in its wake acts of revenge of a similar nature. The number of victims of the civil war has been estimated at close to 100,000 killed, including a large number of civilians, among them women and children."