There is simply no excuse for blocking the entry of food into a region wholesale. For that alone they should, at the very least, be an outcast in the international community. But here we are.
The claim I've heard them make is that the food aid is making it in, but being stolen by Hamas so that it can be resold at markup. How do you convince people that believe this that it isn't true (or is irrelevant)?
And/or the Israel-backed ISIS groups[1][2].
[1]: https://www.ynetnews.com/article/sytu2q1mel
[2]: https://www.cbsnews.com/news/israel-hamas-war-netanyahu-armi...