IMO, if 10% of Perkins story is true--we have a problem. Best way to fight terrorism aimed at us is don't mess around with the affairs of other Nations...See Ron Paul
I look at the issue completely differently..
If we assume that 10% of his story is true (I'd argue that its a little more true than that, even.. but the number isnt really relevant here).. then that means that 90% of his story is false.. and therefore we cannot trust anything he says..
context is everything.. much of his "truth" is placed into context that is false.. and thereby renders the end findings of no value.. again, it makes a compelling story.. and an entertaining read.. but it doesnt make it truthful or an accurate assessment of how things really are...
while his opinions of what is ethical and moral (when placed in the context he utilizes) pull on heartstrings.. it does not change the fact that what he disagrees with is in fact both legal (not only in the US, but in most places on earth), and common practice among most of the worlds developed nations..
While I agree with many of Ron Pauls thoughts on domestic policy and fiscal responsibility, etc.. I think his views on foreign policy are completely off base much more often than not.. he certainly isnt a counter-terror or anti-terror expert in any capacity..