That's rhetorical, of course. The reason why the PLO has an official presence there while, say, the Taliban and Boko Haram don't is because, for far too many in this world, the jihad that's being waged against the Jewish state has been excised from the larger context of global jihad.
I still harbour no great hopes for the Trump/Kushner "peace" push, but shuttering the office of a body intent on "liberating" Israel from the Jews and transforming it into yet another failed Islamic entity strikes me as being an awesome idea.
Update: About that mission...:
The United States allowed the PLO to open a mission in Washington in 1994, a move that required then-President Bill Clinton to waive a law that said the Palestinians couldn't have an office. In 2011, under the Obama administration, the United States started letting the Palestinians fly their flag over the office, an upgrade to the status of their mission that the Palestinians hailed as historic.
Israel opposes any Palestinian membership in United Nations-related organizations until a peace deal has been reached.Update: America One Step Closer to Defunding Palestinian Terrorists