That's the fundamental problem with charities operating in areas controlled by Muslim terrorists, not just in Israel, but around the Muslim world. You are likely to end up financing Islamic terrorists either directly, by paying protection money to them in exchange for being allowed to operate, fairly common in Syria for example, or by being infiltrated by them.
The latter appears to have happened to World Vision.
The facts included in the indictment describe El Halabi as having a master’s degree in engineering. A member of Hamas since 1995, in 2004 he joined the Izz ad-Din al-Qassam Brigades, the military arm of Hamas. In 2005 he was hired by WV to carry out administrative assignments at the charity’s Gaza branch. His job provided him with an entry permit into Israel. El Halabi exploited his visits to Israel to locate and mark [via GPS] sites near the Erez Crossing that potentially could be used as egress points for Hamas attack tunnels.
Carrying out his assignments, according to the prosecution, El Halabi usurped millions of dollars in donations that arrived from foreign countries such as the US, Australia, Germany and the UK, and were slated for humanitarian needs, agricultural, education, and psychological support.
According to El Halabi, the humanitarian aid donated for the residents of the Gaza Strip was in actual fact given almost exclusively to Hamas terrorists and their families. Non-Hamas members almost never received any benefit from the aid, despite their relative level of need. Needless to say, this is in contradiction to the accepted practice of the humanitarian aid organizations. Every month, El Halabi distributed thousands of packages of food, basic commodities and medical supplies to Hamas terrorists and their families, commodities that World Vision had intended to go to the needy.
Over his many years working for WV, El Halabi transferred to Hamas’s possession thousands of tons of iron rods, digging equipment and plastic hoses, originally intended for agricultural use but in reality utilized by the Hamas tunnel builders and for building military bases such as the “Palestine” military base which was built in 2015 entirely from British aid money. Some of the money went to pay the salaries of Hamas terrorists and, in some cases, senior Hamas terrorists took large sums of money for their own personal use. During the war of 2014, Hamas terrorists received WV food packages to sustain them above and below ground, including in terror tunnels.
El Halabi also provided plastic sheets bearing the WV emblem to cover the openings of tunnels, making them look like agricultural hothouses.
Hamas obviously has a long history of hijacking humanitarian projects. And considering its scope of control in Gaza, it was always unrealistic to expect anything else. Hamas is a terrorist group and it's always going to exploit any and every available resource coming into areas under its control. It resells expired medicine that were sent as humanitarian aid. So this was inevitable.
And the common sense reality is that if a charity operates in Gaza, it's going to end up aiding Hamas, whether it does so knowingly or unknowingly.
The only charity possible in Gaza is getting rid of Hamas.