When something as public as 9/11 happens, an emotional, unconsidered reaction is the easiest response. Whilst the book is not - and does not pretend to be - a complete explanation as to why 9/11 happened, it addresses many of the key questions, and helps rationalise.
Any major historical event has multiple intepretations depending on individual perspective. What appeals about this anthology is its multiple (fifteen) analyses, underwritten by the balanced, authoritative experience of some of the best BBC journalists.