The following sentence in a WSJ news made me think how people will justify even collataral damage in a war.

The chance killing demonstrates an additional benefit of the drone attacks, which the CIA has intensified over the last year. Because militants congregate, a drone's hellfire missile can take out targets intelligence officials didn't even know were present.

source: http://online.wsj.com/article/SB124837464714276641.html#mod=whats_news_free?mod=igoogle_wsj_gadgv1

... Yes, among the hundreds killed one guy really turned out to be someone you really wanted to kill.