Jeff Hanley got fired (*oops I mean promoted) for being too gung-ho on Ares after being told told to stand down. Maybe not the best source! Have you seen pictures of Titan 4 blowing up.......seems unlikely to me......but point well taken.From the same article, it appears that there are differing opinions on the matter:
But Jeff Hanley, who manages NASA's Constellation program that includes the Ares I, questioned the validity of the Air Force study because it relied on only one example. He said NASA had done its own study, using supercomputers to replicate the behavior of Ares I, that predicted a safe outcome.