Humanitarian groups have thousands of tons of food, fuel and medicine ready to send to Gaza. That aid is sitting in Egypt, Jordan and Cyprus, just hours away, or less, from the people who need it. But much of it can’t get in.

Why? Some problems are typical for a war zone. Aid groups want to protect their workers from bombs and gunfire. Roads and warehouses are destroyed, making the terrain difficult to navigate.

But there have been bigger problems: Israel has enforced opaque rules that turn back trucks meant for Gaza, citing security concerns. Egypt has blocked aid to protest Israel’s military operations. Hamas has stolen, or tried to steal, aid shipments for its own use.

In other words, the people in charge of allowing aid into Gaza have prioritized their own interests over helping hungry Palestinians. In doing so, they’ve repeatedly made decisions that humanitarian groups can’t overcome. Today’s newsletter will explain what’s keeping aid out of Gaza.

Israel typically cites two justifications for blocking aid: It wants to stop any supplies that can help Hamas, which attacked Israel on Oct. 7. And it wants to keep aid workers out of harm’s way.

The first reason is the more contentious. American officials and humanitarian groups argue that Hamas has intercepted very few shipments. Critics say that Israel has been too careful about an overblown threat — or, worse, has used the aid as a weapon against Palestinians. “They are trying to provide a plausible cover story for collective punishment,” said Jeremy Konyndyk, president of Refugees International, a humanitarian organization.