Cause and effect (in relation to the Arab Israeli war in your instance) are always good, as historians must speculate a little bit to come up with answers.  As such, we arrive at a wide range of different opinions from different historians.  Either would be suitable.  (In the question I would include the word "historians" (as in "what have different Historians...blahblahblah); or failing that something like "How have interpretations changed/how do interpretations differ"...).  
That human rights one would also be good, as there is a lot of debate in the current situation about who is responsible for the deaths of innocent Palestinians.