So you make your point by posting an Ellis Henican column... pure genius.
The bias of the book authors is more to the point. As I told Congressman Billybob, Barrett (one co-author) has been savaging Giuliani in print for years. I would not expect him to give a balanced account. Still, even if this is only one side of the story, the detailed attack is one that Giuliani supporters will have to answer.
Now let me turn it around. Everybody stop firing at Henican and Barrett for a moment. Answer me this: What basis is there for considering Rudy Giuliani a particularly effective leader against terrorism? He happened to be Mayor on 9/11. He performed well on television that day. Anything else? Even if you reject the attacks on his performance, can you point to anything substantive that would be in his favor? He'll need to be able to point to something when people start bringing up his adultery and his general rejection of social conservatism.