The thinking was that, because he had negotiated an end the Vietnam War which he had been busily escalating for several years, he and the lead Vietnamese negotiator both deserved to share the prize. The war hadn't ended, or anything, they'd just signed an agreement (which both sides more or less ignored.)
Every single person at the time thought it was the stupidest thing they'd ever heard. Even the New York Times could see that something was amiss; with their usual bold commitment to justice even when it contradicts the whims of American empire, they declared that it was "at the very least, premature." Le Duc Tho, the Vietnamese man who he was meant to share the prize with, angrily declined his half of the prize. Kissinger almost declined the prize... not because even he could see that is was an absurd joke, but because he was offended that they were going to give it to Le Duc Tho also. You know... peace-man logic.
When Kissinger entered the conference room, nobody spoke to him. Sensing the hostile mood, Kissinger speaking in French said: "It was not my fault about the bombing". Before Kissinger could say any more, Thọ exploded in rage, saying in French: "Under the pretext of interrupted negotiations, you resumed the bombing of North Vietnam, just at the moment when I reached home. You have 'greeted' my arrival in a very courteous manner! Your action, I can say, is flagrant and gross! You and no one else strained the honor of the United States". Thọ shouted at Kissinger for over an hour, and despite Kissinger's requests not to speak so loudly because the reporters outside the room could hear what he was saying, he did not relent. Thọ concluded: "For more than ten years, America has used violence to beat down the Vietnamese people-napalm, B-52s. But you don't draw any lessons from your failures. You continue the same policy. Ngu xuẩn! Ngu xuẩn! Ngu xuẩn!" When Kissinger asked what ngu xuẩn meant in Vietnamese, the translator refused to translate, as ngu xuẩn (in Chữ Nôm: 愚蠢) roughly means that a person is grossly stupid.[43]
When Kissinger was finally able to speak, he argued that it was Thọ, who by being unreasonable, had forced Nixon to order the Christmas bombings, a claim that led Thọ to snap in fury.
They weren't great friends. Of course, in the end, Kissinger decided that he owed it to himself to collect his prize, although he didn't come in person because he probably would have been protested (and maybe arrested, I don't remember the timeline.)
