NEW YORK – Ten months ago, the United Nations Security Council, with no dissent, authorized the use of “all necessary measures” to protect civilians at imminent risk of massacre in Colonel Muammar el-Qaddafi’s Libya. Those lives were saved – and, if the Security Council had acted equally decisively and robustly in the 1990’s, so might those of 8,000 others in Srebrenica and 800,000 in Rwanda.