> Not to mention the fact that there wasn't a disruption in the relationship with Saudi Arabia comparable to the disruption in the relationship with Pakistan.

That's simple: US needs Saudi cooperation wrt oil prices. Saudi Arabia and the other OPEC states always can either dump a shitload of oil on the market to crash prices at no real cost for them (but huge cost losses for Western oil companies, esp. fracking - we're seeing this right now) or decide to artificially limit or stop their oil production, again at no cost for them but another oil crisis in the Western societies.