What experts? Noam Chomsky is an expert in some things?
There are rows of experts that will attest the the central point made by Rep. Tancredo and the authors of the above editorial.
Let look at a few, shall we. Lets start with Prof. Bernard Lewis - Professor Emeritus of Princeton University and author of more than two dozen books on Islam and the Middle East. Here is the link to an article about a recent speech he gave:
Bernard Lewis Credits Bush on Iraq His most recent book is called: The Crisis in Islam: Holy War and Terror, which might tell you something.
Moving on to a author born into the Islamic faith who has also written a half dozen books on Islam one comes to Ibn Warraq. (A pseudo-name. Islam doesn't take kindly to aposty or strong criticism, as you no doubt know. Institutionally it is willing to condemn people to death for renouncing the faith.) An excellent book that explains, in their own words, what many individuals have experienced as the teachings of the faith is his: Leaving Islam: Apostates Speak Out
The authors, while not academic experts, though Warraq does a nice job of framing and organizing the material, but certainly real life experts on Islam from the inside. Excellent book.
Another recent one I found interesting was Matyrdom in Islam by David Cook, who is a Professor of Religion at Rice University.
To move from a specialist to a generalists many of the most basic reasons for the conflict were very well laid out in Prof. Samuel Huntingtons precient The Clash of Civilizations and the Remaking of World Order He is the director of the Olin Institute for Strategic Studies at Harvard University.
Please note I've left off all books by the uncreditentialed, those writing Christian apologetics with PhDs from Bible Colleges, and anything for the general reader here.
And of course the ultimate source of "Why did Bin Laden do it?" are his won writings, two volumes of which are available currently: Messages to the World: The Statements of Ossama bin Laden and Osama bin Laden: America's Enemy in His Own Words
I believe a fair minded review of the relevant expert literature on Political Islam will reveal that Rep. Tancredo's claim is esentially correct and that Rep. Paul is simply wrong.