No, Saudi Arabia was not responsible for the attacks on 9/11. Saudi Arabia was not sympathetic concerning the attacks and even seemed to cheer so Americans may want to hold them responsible for some part of the attack. There is probably no substantial proof, however, that the country is responsible for the attacks.
So far the evidence has pointed to the Taliban and Osama Bin Lauden acting alone. Saudia Arabia may have supported the Taliban is some way, either financially or looking the other way, but they were not responisble for them. The Taliban carried out the attacks and planned them down to the last detail.
People can be so stubborn.
For years we have been hearing that Saudi Arabia was responsible, at least in part for the 9/11 attacks. Either them or US government or the Illuminati. It's hard to keep these things straight.
But for the Saudis, the conspiracy theorists have proof.
It's just that the proof is written on classified document which they have never read. But's it's there! They're sure!
And now said document had been declassified. Surprise, surprise: no proof. Maybe they'll go back to looking for bigfoot now.
While the declassified documents on 9/11 make sensational news stories, there is little solid evidence that Saudi Arabia was responsible for the terror attack. Official have said over and over that this was just one lead that was investigated after the tragedy. At most it make link one or two Saudi government employees to the attack. This is not the same as claim the entire country or government is responsible. Ultimately there is not enough evidence to support this.