You are forgetting 1948, 67, 73 when lots of Arab countries waged large scale war against Israel. There was even a huge oil embargo in the 1970s by Arabs against the West, causing huge economic turmoil.
Of course having a good relationship to the US is important to many countries. It’s very beneficial to them. However those governments opposed to the US aren’t particularly great for their population either.
There’s certainly no lack of bad regimes in the Middle East. Bribes and arms deals are just how business is done there.
Regarding Prince Bandar and Saudi policies in the region. Saddam’s Iraq became an enemy with his invasion of Kuwait. Iraq had been a regional rival to the Saudis even back to the time it had a Hashemite king. The Hashemite and Saudi clans are old rivals for power in the region. Saudis have their own interests in the region. Iran is a regional rival for example and their Islamist ideology a direct threat to the kingdom. Yes, Saudis have played some stupid games with spreading Wahhabism and supporting Islamists militias against other governments in the region. Of course the Saudis prioritize their own interests above the Palestinian cause. They have been a big supporter historically both financially and politically.
I really recommend you watch the interview to hear another perspective and his personal interactions with Arafat during the peace process.
Also Palestinians have agency and have influenced the history of the region significantly since 1948. It’s patronizing to see them only as victims.