That's one of my faves of all time, because the actor for Lincoln just does it PERFECTLY. The hesitation, the conflicting war on his face, KNOWING what he's going to say, and yet regretting it in advance... It's just... delicious.
... You don't get it. Just because you don't lie doesn't mean you're telling the truth. It is the 'You look beautiful' to the 'Does this make me look fat?' You tell the truth, but you never answer her question, thus not lying. Just avoiding. That is what I am trying to distinguish.
That's where the Japanese language shines - it has a multitude of sentences and word structures meant solely for the purpose of answering questions without actually saying anything. That's because in Japan it is considered impolite to actually tell your opinion, even when people have asked for it. Isn't that neat?