Instead of indiscriminately killing thousands or millions of civilians that have nothing to do with it, how about cleaning up your place first? Stop giving them the support that allows them to spread their radical message throughout the region.
Hmm... I agree to a limited degree with your argument. Rather than taking out all the Saudi civilians (there are more than 30 million of them, growing at 3% per year), we can just take out the Saudi Monarch and the other members of the Al Saud royal family. A secular regime should be established, and Islam should be banned.