I think the overall point that could be made is not about how useful the help is on an absolute basis, but rather how petty it is compared to the devastation that Palestinians have been subjected to for decades, regardless of the presence of terrorist activity.
The overall injustice that Israel and the IDF represents over the whole timeline is staggering. Pogroms, massacres, bulldozing homes, murder of peaceful protestors, monetary contributions to Hamas, apartheid style laws, and not to mention the now extremely prejudiced bombing of Gaza where they are cut off from resources, and cannot even freely evacuate.
Israel has historically, and now quite directly, placed the Palestinian people into an absolute meat grinder. In the context of this, sending fuel to a hospital is clearly bad faith, even if it was guaranteed to last a week instead of a day.
The scary thing is that Israel also has a direct and clear interest in wiping out/exiling all palestinians. It's the only way they can reasonably have access to all of what they say is their promised land. It would be ignorant of the circumstances and ignorant of history to not take this into account: Israel's actions since its establishment have shown overwhelming disdain for the Palestinian people's existence and to that end they have committed similar atrocities to Hamas, but with orders of magnitude more victims.