Did Clinton lose his temper on purpose?
Clinton is a man who has difficulty controlling his passions. Having met both Juanita Broaddrick and Kathleen Willey, I can tell you that what they have to say about this man's behavior when he's not in front of a TV camera is simply amazing. Clinton can be just as reckless and thoughtless as he is Machiavellian.
Furthermore, in terms of what he cares about, Bill Clinton is all about Bill Clinton. So my hunch is that when Wallace asked a tough question, Clinton snapped over what he perceived as an attack on "his legacy" and gave an unrehearsed, emotional response. That's not unlike his foolish finger-waving "I did not have sexual relations with that woman" episode from 8 years ago.