A "Department of Peace" sounds Orwellian, but the concept is quite the opposite.
You just can't make this stuff up. These folks are living in a Kindergarten world. That's fine for Kindergarten, but the Big World is not always benign, nor is the pursuit of "niceness" a prime driver in human nature. It would be a very dull world if that were the case.
And, by the way, don't we already have a State Department? What's their job?