You ought to double-check your facts before you go out on a limb with this kind of easily rebutted accusation. I didn't have to look hard to find plenty of condemnations of the 9/11 attacks by Muslim scholars (including clerics) and other prominent Muslims:
This link indexes many condemnations:
Muslims Condemn Terrorist Attacks
Here are some other examples:
Muslim Clerics Condemn Attacks On US
Muslim clerics say attacks in US are un-Islamic
Sheikh Yusuf Al-Qaradawi Condemns Attacks Against Civilians: Forbidden in Islam
Muslim scholar: Terrorists are mass murderers, not martyrs
Australian Islamic Council Condemns Attacks in US
"Seek and ye shall find".
But, many have also not condemned it in a religion with upwards of a billion adherants and many of the condemnations are equivocal IMHO, sometimes indicating that America is somehow responsible.
Having said that, I realize that there are those who have condemned it and I am grateful for those who have.
I know many good, honorable Muslims myself who have condemned it and therefore understand that what we are fighting are extremists who are subverting their faith ... the problem is, the outcry should have been deafening ... and (this is my opinion, it costs you nothing so you can do with it as you please), in my opinion the outcry has been far less than deafening.
I believe if you read all of my responses you will find that my beliefs and opinions regarding this are even tempered and willing to give the benefit of a doubt.