Ad hominems are not valid rebuttal's.I hope you don't feel a need to post the entirety of Fisk's book. To describe Robert Fisk as principled or with similar terms is denying that he is ridiculed by his peers as a hack. Within any profession, ridicule by ones peers is the most damaging thing that can occur.
Fisk is ridiculed ruthlessly for his creative flights of fancy and for his lack of ethics. I find it remarkable that anyone would insist that they have a monopoly on truth when their truths are derived from someone who is viewed as an embarrassment by his peers.
You can do your on research and discover the reactions to Fisk by his peers. so much of his work is discredited as biased and unverifiable, to cite him as a holder of "truth" is to accept his biases.
I can understand that you want to believe him because you find a resonance with his views. You also need to understand that others are free to point out that if you only accept the views of those with a reputation for being a hack, that calls into question your credibility, also.