The reaction to this decision has been mostly negative.
Some have objected to the Trump administration's decision because it runs counter to U.S. interests. Some have objected because it jeopardizes Israel's security. Others talk about the staggering humanitarian consequences for the millions of refugees UNRWA serves.
These are all important concerns. But none of them hits the mark of what the Trump administration—apparently at the urging of Israeli Prime Minister Benjamin Netanyahu, without any consultation with anyone else in the Israeli government or defense establishment—is doing. This is not merely an attack on UNRWA, as serious as that may be. This is an attempt to destroy the Palestinian national movement.
As I have long argued, the biggest single issue in the Israeli-Palestinian conflict since 1948 is not Jerusalem, settlements, borders, or even security. It is the Palestinian right of return. It is the one issue Israel would not discuss in talks and Israelis, with very few exceptions mostly on the far left, will not even consider compromising on.