Starting off with Paul Krugman's Op Ed,Reclaiming America’s Soul, the quote above is from him.
What about the argument that investigating the Bush administration’s abuses will impede efforts to deal with the crises of today? Even if that were true — even if truth and justice came at a high price — that would arguably be a price we must pay: laws aren’t supposed to be enforced only when convenient. But is there any real reason to believe that the nation would pay a high price for accountability?
... snip ...
We need to do this for the sake of our future. For this isn’t about looking backward, it’s about looking forward — because it’s about reclaiming America’s soul.