US was the only country in the world which was willing to subdue then formidable Iraq in 1991 in order to protect Saudi Arabia and liberate Kuwait - when Saudi Arabia was seeking such help. Nobody else had the political will and/or military muscle.
After the aforementioned deed, US could stay in Saudi Arabia (and Kuwait) for indefinite period but minimized its footprint in the region instead. Saudi are not a thankless bunch; they remember and appreciate American support in all forms but they are also gifted geopolitical navigators. In fact, when Allah Almighty is willing, wonders happen.
US - Saudi relations are on an entirely different trajectory than US - PAK relations at present. However, Pakistan have always left the door for negotiations open. Pakistan is only protesting against mistreatment at the hands of Americans and rightfully so, and US have got the message (Pompeo's visit). But go overboard in showing them attitude, and they will respond in kind (or worse).
US is certainly politically arrogant and mischevious at times, but same was true for the Ottomans. Since you have Turkish roots, you would have a basic idea of Turkish history.
US - Saudi relations are good in the sense that they have a soothing effect on the phenomenon of the clash of civilizations - a bridge between WEST and Islamic bloc of sorts, and this is the need of the hour.
Being critical of American policies is one thing (you have every right) but declaring an entire country Beni Sheytan - imply psychological troubles. US have also revolutionized the lifestyle of people in modern times through its scientific contributions, or these contributions are also the work of Beni Sheytan? The very computer you use is an American invention. Much of the education you have - is grounded in the works of Americans and even Jews.
You have no idea how much is rotten within Pakistan, but their is hope as the outcome of 2018 elections showed.
Study Holy Quran in full and you will learn a great deal. And don't be full of hate. Be pragmatic and open-minded instead.