With the current situation prior to the attack how much was palestine costing Israel? Gaza cannot supply itself with water, electricity, or food. Israel needs to maintain border security too. Without palestine these costs go away or at least decrease significantly. Israel has already stated they believe this attack justifies them cutting off water, electricity, and food supplies in perpetuity. This in affect will kill most of the 2 million and will cost them less political capitol than bombing the Palestinians.

So why do they want to commit genocide? Money, power, revenge, racism, and religion are the main reasons, but they vary from person to person obviously.