There is no such thing as a Palestinian nationality because there never was a Palestinian nation, NEVER EVER! Not in the history books, not according to archeological evidence... Palestinian is a false claim made by arabs from arabia in order to steal Jewish land. Also this Nidal Hasan never claimed in his presentation that this was a reason for Jihad... You also know that Jerusalem and Israel are never, ever even mentioned in the Koran.... There is no reason for arabs to claim Israel other than their strong antisemitic sentiment.
Nidal Hasan did not act in the name of palestine... He acted like a brave Muslim waging jihad against the non-believer... All his imams praise him for this.... There is no reason to go about making up reasons, just read his own words...