The comments were Bigelow's most explicit reaction to the controversy so far.
"As for what I personally believe, which has been the subject of inquiries, accusations and speculation, I think Osama bin Laden was found due to ingenious detective work," she continued. "Torture was, however, as we all know, employed in the early years of the hunt. That doesn't mean it was the key to finding bin Laden. It means it is a part of the story we couldn't ignore."
"War, obviously, isn't pretty, and we were not interested in portraying this military action as free of moral consequences," she added.
Bigelow wrote that torture was part of the story and the backlash may be misdirected.
"Those of us who work in the arts know that depiction is not endorsement. If it was, no artist would be able to paint inhumane practices, no author could write about them, and no filmmaker could delve into the thorny subjects of our time.
"This is an important principle to stand up for, and it bears repeating. For confusing depiction with endorsement is the first step toward chilling any American artist's ability and right to shine a light on dark deeds, especially when those deeds are cloaked in layers of secrecy and government obfuscation.
"I do wonder if some of the sentiments alternately expressed about the film might be more appropriately directed at those who instituted and ordered these U.S. policies, as opposed to a motion picture that brings the story to the screen," she wrote.