I doubt the true bombers identities will ever be known but it is a good guess Al Qaeda is at the center of the activity. The House of Sa'ud will do nothing until it is attacked. Meanwhile they go after those who cannot protect themselves, namely guests of Saudi Arabia who under that nation's oldest traditions should be safe.
The Arabs are indeed sliding on a slippery slope.
I predict that the toppling of Saddam Hussein will cause the House of Sa'ud to collapse like a house of cards. It is only a matter of when.
The Saudi population, that is Saudi Citizens, has probably tripled in the last 20 years. In the glory days, when they were just encouraging people to settle down , any Saudi who wanted transportation dropped by a government office and was given the ubiquitous white king cab Toyota pickup. Wrecked it? No biggie, get another.
Bad stomch pains? No problem, fly you to Vienna. Need food, need a loan, need some land? Hey, no problem. This oil-fed idyll lasted about 5 years. But Saudis began marrying at a dizzying rate. Two, Three, Four Wives. Ditch one, pick up one or two more. (some Saudis have only one wife) At any rate it is not unusual for a man of 40 to have 40 children ... or more!
What was a cool deal for 5 Million Saudis could not be extended to 20 Million. And, these people do not really have a work-culture. Everything from garbage pick-up to rocket science is handled by foreign workers. Sure, as time goes by, more and more Saudis are somewhat gainfully employed. Someday, it might even reach 50%! Meantime, the economy has to support them, and still pay a couple of million foreign workers to keep the place going.
No one is more painfully aware of the situation than the 3,000 Princes of the blood and the 5,000 other unblooded princes, all of whom are on the national payroll for dizzying sums. However, their deal is getting tougher, too. They have to pay utility bills now, and actually pay for airline tickets! Maybe. Frankly, these princes and their families are terrified and many are as pathologically stupid as only the inbred can be. They will try anything to stay in power: Payoff to bin Laden, work for the government, run away to Switzerland, become brain surgeons, join the secret police ... anything!
The problem is that if you took every princely dime and spread it around, it would only be a temporary fix. There are millions of unemployed and probably unemployable young Saudis out there without an allahdam thing to do, except make trouble.