Why did an Israeli commission find Ariel Sharon indirectly responsible for the Sabra and Shatila massacres?

In September 1982, during the Lebanese Civil War, militia members of the Phalange—a right-wing Maronite group allied with Israel—committed massacres at the Sabra and Shatila Palestinian refugee camps while operating under an Israeli military umbrella.12

Following widespread public outrage, the Israeli government convened a judicial commission of inquiry. In its 1983 report, the commission found Ariel Sharon, who was serving as minister of defense at the time, "indirectly responsible" for the massacres. The commission concluded that he was unfit to retain his office because he had permitted the Phalangist forces to enter the camps despite the known risk of violence, failing to take adequate measures to prevent the atrocities. Consequently, Sharon was forced to resign from his position as defense minister in February 1983.12