Gaza is sof densely populated the economy is dependent on food aid. Israel has limited the flow of trucks into Gaza, largely to prevent Hamas from gaining access to military supplies. Hamas has had 16 months to lay down their arms and release all the hostages, and the problem would have been solved immediately.
The vast majority of food is not brought in by UNRWA, and they cannot troll food delivery because of all the lawlessness. Hamas must put an immediate end to what they have initiated.