That is a very good question, and one I wholeheartedly support having a sincere conversation about because I share the same concern. (1) Israel left them with industrial scale greenhouses in 2005 that Gaza could have continued operating to earn money from exports. (2) Israel continues to give Gaza free water and energy despite Hamas destroying its own water infrastructure in order to build rockets out of water pipes. (3) Has anyone else in the world done better than Israel in this regard, ever? If so, please give concrete examples so Israel can learn from them. (4) Do you have any concrete proposals yourself? If not, you're just writing meaningless self-righteous chatter. I have a concrete proposal at the end of this article https://medium.com/non-violence/either-offer-reasonable-actions-to-israel-or-destroy-hamas-the-saw-psycho-killer-w-wwii-style-a4bafd1fc394