If you look at the themes that he struck from the minute he started running for president through today, there is a very high level of consistency, and there is a sense that he is who he is. Obama's governing is completely consistent with the way he campaigned and the themes on which he campaigned, the issues he highlighted, the vision he shared.
One isn't necessarily born with courage, but one is born with potential. Without courage, we cannot practice any other virtue with consistency. We can't be kind, true, merciful, generous, or honest.
Because interrogations are intended to coerce confessions, interrogators feel themselves justified in using their coercive means. Consistency regarding the technique is not important; inducing anxiety and fear is the point.