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Why has al Qaida not crossed the threshold for using WMD in terrorist attacks, as in the case of Aum Shinri Kyo? What do the readings describe as the most common group motivation for using WMD? Does that seem to apply to al Qaida?

readings:

Harvard Study on Organizational Factors and the Pursuit of WMD

http://www.hks.harvard.edu/netgov/files/NIPS/Rethemeyer_ConnectionCanBeToxic_IDs.pdf

Harvard Belfer Center Assessment of Al Qaida's Religious Justification for WMD

http://belfercenter.ksg.harvard.edu/files/aq-religious-justification.pdf

RAND Study: Breaching the Fortress Wall , read only the Introduction (pp. 1-8) and Conclusion (115-134)