I think calling Lightoller an outright liar would be a bit harsh. Yes, as I have repeatedly said, I believe he was a man with a great sense of self-preservation and consciously or subconsciously was going to protect "Number One" no matter what. Yes, he was a good "Company Man" and probably thought long and hard about what he was and wasn't going to say during the long hours on board the
Carpathia. Yes, he did make statements that were contradictory and some of them were later shown to be inaccurate. But for all that he too went through a traumatic experience and as the most senior surviving officer, would have been under pressure knowing that he would be grilled during the Inquiries; and he most certainly was, on both sides of the Atlantic.
As far as his book was concerned, I have read a few readers' comments that they felt Lightoller's memory was perhaps fading when he wrote the book. As someone with a medical background, I'd like to qualify that opinion. I don't think Lightoller's apparent failing memory was age-related; when Lightoller wrote his book, he was slightly younger than
Captain Smith had been on the
Titanic. I think some aspects of the
Titanic disaster itself had become a bit disorganized in his mind, at least partly due to his knowledge of other testimonies and opinions. That sort of thing is a human tendency.