I think it went a lot of the way to explaining the bleakness and despair in the character of John Rebus.
I do have a lot more respect for Rankin, and the struggles a writer has to go through after watching the interview. In fact I feel a bit guilty at not liking Rebus more, because Rankin's first real success with the novel Black and Blue was achieved at the time he discovered his second child had "special needs".
His ability to exorcise his anger on the written page, with the character of John Rebus is probably very cathartic.
I will probably read more of Ian Rankin.
Ian Rankin joins Carlo Lucarelli, and David Liss, as PhD students who started a thesis, which they never finished because they wrote a crime novel instead.