try to educate yourself first:
Israel keeps secret its guidelines on how it differentiates between humanitarian necessities for Gaza’s 1.5m residents and non-essential luxuries, citing security reasons. Its choices, however, are often baffling. Food products prohibited from entering include jam, chocolate, biscuits, potato chips, fresh meat, coriander and industrial margarine, according to human rights groups. Other banned goods include musical instruments, pens, notebooks, toys, cars, fridges and computers, as well as building materials like cement, iron, gravel, marble and some wood. Additionally, Israel only allows in just over half the weekly industrial fuel needs for Gaza’s only power plant, as well as less than half of the region’s necessary monthly gas supply, according to activists.
http://www.ft.com/cms/s/0/698c8b84-6cc0-11df-91c8-00144feab49a.html
So I dont think they leave any other choice here when they have problem with jam, chocolate, biscuits, potato chips, fresh meat, coriander and industrial margarine, pens, notebooks, toys..