Realpolitik is arguably the only geopolitical philosophy countries have ever operated under in modern times. We throw revisionism into the history books to feel better about ourselves after the fact. You're here citing Kissinger as a venerable authority rather than an amoral war criminal, case in point.

KSA exports the same toxic religious fundamentalism, the same if not more radical than anything Iran espouses. The difference is they have the fig leaf of support from first world countries as they do it.