Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Is it ethical to sell this book

This book was written in 2000 from events occuring in 1998!!! Totally out of date! Useless!! Wondering why it is still for sale. The author, contacted by email responded but did not address the questions asked, simply giving excuses and mentioning that he wrote another book much better than this one... Outrageaous! Spread the word and if you own the book, get your money back!