Don't waste your time. The two authors clearly have an agenda and appear to be showing off "We're the smartest guys in the room". Clarke, best known for his arrogance during the Bush administration, is one of the co-authors, and he continues his "I knew better" shtick.
The examples included in the book - Fukushima, Hurricane Katrina, to name but two - are covered on a surface level. In each case there's a "hero" who sounded the alarm and a whole bureaucracy who ignored him (or her). There is much more to every one of these situations than that; the authors tell a simplistic story to match their agenda.
The points that are raised are worth considering, but their authorship is not.