I agree with you.
As another recent ex-expat (7.5years in RUH) I met hundreds of genuinely nice and helpful Saudi people. In fact Britain would be a better place if it adopted one or two of the basic rules from over there. No I'm not a Muslim.
However my previous work existence meant I also would meet many of the poorer Saudis & go places where many of the Richer/better paid expats would never go.
This was bubbling over a year ago, the attack on Iraq gave them the excuse to attack.
I knew of the undercurrent of hate towards 'American Imperialism' was strong but in certain areas it surprised me how deeply it was felt. I was a warden for the British Embassy.
The reported ramming of the doors in Jadawel compound (a beautiful but grossly overpriced location, filled with American top executives) was no surprise as it was a technique used by the Muttawa during the Xmas/New Year period of 1999/2000 to raid where there were suspected parties.
I believe if the Saudi Government wanted to stamp out religeous fanatical terrorism they could, just by stopping the Muttawa & compulsory prayers for all Muslims.
Most normal Arabs want a quiet, normal, peaceful life.
Not religeous fanaticism.
My thoughts & prayers go out to the victims, their families and especially the expats still left in the Kingdom.
Given the chance I will go back to Saudi, one day when it is more calm.