First, I agree with Riv. The people “to blame” for 9/11 are the people that planned, funded, and executed 9/11. You don’t blame a rape victim for getting raped, you don’t blame a president for his country being attacked.
Second, you can however point to actions that helped enable it or increased the risk for such events to happen. Clinton is responsible for a large number of such things. While yes, Bush followed Clinton’s precedence, Clinton was physically in office and in power for the 1993 WTC bombings, the Khobar tower bombings, the Embassy bombings, and the U.S.S. Cole bombings giving him thorough and direct experience with these things multiple times. It was under him that the Gorelick Wall truly came into prominence, causing intelligence not to be shared between cases. It was him in the Commander and Chief position during Mogadishu. And while I understand the hesitance of believing a terrorists statements these statements mixed with previous ones by Bin Laden that, given their context, read more as actual belief than simply propaganda gives credence to the notion that they had largely viewed us as weak willed when it came to military matters.
Is this to say that the actions of Clinton are the ONLY ones that helped open up the situation to happening, or that Clinton is the only politician or President to have not taken it seriously or performed actions that exacerbated the situation? Absolutely not. Its undeniable our continued presence in the middle east and support of Israel angered Bin Laden and Al-Qaeda. One could argue our support of the rebels in Afghanistan during the cold war directly lead to their gain in power which lead to 9/11. One could also argue that those were “Good” actions that contributed to the end result while Clinton’s were “bad” actions, hell I’d say I’m more in that line of thinking then the other ways.
What one can’t say however is that Clinton and his policies were directly, and seemingly through the implications primarily or solely, responsible for creating the situation in which 9/11 occurred. I do personally believe he had a large hand in it, but the blame for the climate that allowed it to happen can be spread amongst many people even if Clinton is one of the larger ones in that grouping.