One of my favorite online political writers — Josh Marshall of Talking Point Memo — just published a real good article entitled "Why Did So Many People Hate Henry Kissinger So Much?" But I don't think you can read it unless you're a subscriber to his website.
Basically, he asks the question why is Kissinger loathed so much more than Richard Nixon when whatever damage Kissinger caused, it was endorsed and implemented by Nixon. And the answer has a lot to do with Kissinger living a long life and remaining a celebrity, whereas Nixon at least had the decency to get himself almost impeached and lose his office and then die. Those are my words, not Mr. Marshall's. If you're a subscribed to TPM, go read what he had to say.