They tried to explain "1984" to him, but his comprehension was lacking, even in his more lucid moments. They'd all agreed that calling it "The Department of Peace" would allow him to wage pre-emptive "peacekeeping" attacks anywhere in the world whenever he needed a distraction. It would even support his claim for a Nobel prize.
But one afternoon nap later, with only vague memories of the discussion, he signed the order to rename the department.