There is a long, complex history of interweaved problems in Southeast Asia, and the Nixon administration, spearheaded by Kissinger, just came and poured gasoline on it, then got a Nobel Peace Prize for "putting out" the fire (which they absolutely did not do).
There's a part of me that's glad he lived long enough that a significant number of the obituaries are focusing on the long-term consequences of his illegal acts rather than the image he cultivated of himself.