Anyone who claims to be good at lying is obviously bad at lying. Thus - as a writer myself - I cannot comment on whether or not writers are exceptionally good liars, because whatever I said would actually mean its complete opposite.
A lot of people have this strategy where if they have a hard question they wait to ask it to the end of the interview because they think the person is going to walk out. But what they have to realize is, is that if the person walks out, they have a pretty successful story.
To me, every interview, even if you love the artist, needs to be somewhat adversarial. Which doesn't mean you need to attack the person, but you do need to look at it like you're trying to get information that has not been written about before.
At a magazine, everything you do is edited by a bunch of people, by committee, and a lot of them are, were, or think of themselves as writers. Part of that is because magazines worry about their voice.