Lol at casting aspersions on an authoritative text, coming from the press of one of the most reputed Universities in India (check the book), and written by the only professor ever accorded the title of the National Professor of Sikhism. 
 Lol also at inferring historical proximity and  partaking (=joining-in) as being an inspiration ?? Especially when the author clearly says that doing so shows a complete lack of understanding of Sikhism. 
 At least you tried to raise some seemingly logical concerns. The comments from the rest of the mob above are not even worth responding to. Yes, it is a mob, and nothing else. Anyone with an impartial point of view reading this discussion would understand it. The mob can keep writing whatever it wants. Zero credibility though !!