Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A very disturbing book!

It's easy to get taken in by the written word. It has some authority just being there. The power of the truth, however, shines through after awhile, and you realize that what you are reading is substantially correct, especially after checking the bibliography. Neil Sheehan appears to have the test of time on his side. And if this is true, if what's described in this book is in fact how it happened, it should be required reading of everyone with any authority to commit American lives to any cause, from the President on down. The enormity of the ego-driven stupidity of a few men, from Harker to Kennedy, from McNamara to Westmoreland, from Johnson to Nixon is enough to make one sick with rage. For those of us who have spent time at the Vietnam War Memorial in Washington DC, reading names and letting the vastness of it engulf us, the realization of why it is there is almost too much to bear.