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.
“That excitement on the court, I'm the same way off the court. I like to have fun, meet people; I like to give high-fives to the kids courtside. Just have fun. That's kind of my personality, that's how I've been.”