War: When is it right to wage war?

In a recent New York Times report The Pentagon acknowledged that a Navy F/A-18 had dropped a 1,000-pound bomb in Afghanistan near what the locals called an elderly facility. Several hours later, a Navy F-14 dropped a 500-pound bomb on a residential area northwest of Kabul. When is it right to wage war?; some reporters and authorities are asking. Is the war on Afghanistan just.
The article, A Just Cause not a Just War is primarily focusing on the fact that the war on terrorism has turned in a war on innocent Afghan and Iraqi people. The truth is that it has. The city of Kandahar, attacked for seventeen days, was reported to be empty, with more that half of its 500,000 people fleeing the bombs. The electrical grid in the city had been knocked out and the city was deprived of water because the water pumps were electrical. An Afghan elementary school teacher told a Washington Post reporter at the Pakistan Border that : “When the bombs fell near my house and my babies started crying, I ...