Q & A with Jeff Greenfield: 'I have revisited my revisionism'

After writing up the news of Jeff Greenfield's forthcoming book, "What If JFK Had Lived?" I contacted him to see if he would answer some questions about the book's scope and purpose. He responded right away by email.

Q. What is the value of counterfactual history?

A. For me, the value of counter-factual history is two-fold. First, it's cautionary evidence…