Obvious solution #1: nuke Mecca, then issue a warning that unconditional surrenders will be accepted from Saudi Arabia, Syria, Iran, Iraq, et alia for no more than 24 hours. We should have done that on September 12, 2001. Brutal? Yes. Effective? That was the only way we've ever won a war in Asia.
Obvious solution #2: bomb Afghanistan most of the way back to the Stone Age; invade Iraq after bombing it most of the way back to the Stone Age; destroy Saddam Hussein and Baath party; divide former British colony into three ethnic nations; leave with stern warning not to make us return. Issue written warnings to other states supporting Islamic terrorist savagry not to antagonize us. Brutal? Moderately. Effective? Probably for a few weeks.
The sad, sorry, simple fact of the matter is that the Islamic terrorist savages neither respect nor understand anything other than strength.
Let me put it another way: I don't carry a gun so I can reason with criminals.