the way that the arguments are made is so ridiculous but so wide spread in 'technical analysis 101' books... author shows an indicator, some kind of line, then a chart, supporting its supposedly usefulness, completely ignore the basic fact that in order to prove something works a much bigger sample size is needed.
so people read these books and they present the same way... argue a point, put up a chart, a handful of data points - wala there is your proof..