I'm afraid, lounge60's TL has some bad problems. Sorry.
If you read the actual quote in wiki's Diem page, it says exactly zilch about peace, of course.... Good luck finding any evidence of peace....
And, no matter how generous Ho Chi Minh was, Diem was as outmatched on the ground, militarily, as the British general staff were by a certain Washington..... Diem was generally losing turf.
Fat chance, then, that either North Vietnam or Khruschev would've been in any mood for peace. So, Nixon would've been faced with the same losing record, politically, as JFK and LBJ. Would he really have shown more restraint, given Kissinger's distinctly UNrestrained record IOTL?
And, isn't ousting somebody for not being warmonger enough rather more the warmonging GOP scene than we totally peaceloving Dems'?

(SO peaceloving, as you can see in Libya).