When America’s top diplomat called to offer condolences over the killing of his son in the Israeli airstrikes that hit a World Central Kitchen (WCK) convoy delivering aid in Gaza, John Flickinger knew what he wanted to say. The grieving father told Secretary of State Antony Blinken that the killings by Israel in the Palestinian enclave must end, and that the United States needs to use its power and leverage over its closest Mideast ally to make that happen. Flickinger’s 33-year-old son, Jacob Flickinger, a dual U.S. and Canadian citizen, was among the seven humanitarian workers killed in the 1…