Israel's policies caused Hamas, they have plenty of options that don't involve a giant starving ghetto but they choose not to exercise them. In particular: negotiate a resolution with Fatah, then provide Fatah with military support in ousting Hamas from Gaza (e.g. providing them with guns and access to the Gaza strip in the first place). Israel starving Gaza and keeping their economy permanently dead will only feed Hamas's victim narrative and enrage off Gaza's population more.