I guess everyone will have their own theories about why Maj. Nidal Malik Hasan opened fire at Fort Hood, killing 13, and wounding dozens.

How much of it had to do with the fact that he was a Muslim?

How much of it had to do with the fact that he was taunted as a Muslim?

How much of it had to do with his apparent opposition to the Iraq and Afghanistan Wars?

How much of it had to do with his pending deployment to Afghanistan?

How much of it had to do with his familiarity, as a psychiatrist, of the horrors of war and PTSD?

Experts will scour the Internet looking for clues, people will be interviewed, etc.  Hopefully, over time, a clearer picture can be drawn.  In the meantime, one could play these guessing games forever, and I supposed one's speculation at this point says more about the speculator than Maj. Nidal Malik Hasan.