You were downvoted, but you were right in pointing out that the quote was taken out of context. Here's the full context:

"Nixon should be told," Kissinger said, "that it is probably an objective of [Clark M. Clifford, the Secretary of Defense] to depose [Nguyen Van Thieu, the President of South Vietnam] before Nixon is inaugurated. Word should be gotten to Nixon that if Thieu meets the same fate as [Ngo Dinh Diem, a former President of South Vietnam whom the U.S. initially supported, but who was later murdered in a CIA-backed military coup], the word will go out to the nations of the world that it may be dangerous to be America's enemy, but to be America's friend is fatal."

Kissinger was motivating why the U.S. should continue to support Nguyen Van Thieu, the dictator of South Vietnam; but today his words are frequently taken out of context to suggest a self-aware take of U.S. foreign policy.