This person argues that the US should join UNESCO only to defend Israeli war crimes

"Our decades-old laws may have been an effort to stand with Israel, but Israel will be hurt by the U.S. absence at UNESCO. U.S. officials have worked hard to help forestall or mitigate anti-Israeli actions in international bodies. When controversial Holy Land heritage issues are discussed at UNESCO next year, a non-voting United States will be less able to help its ally. "