Wow, nice amount of questionable factors there.
1. Occupation doesn't mean shit, child workers touch kids all the time, don't pretend that every doctor thinks the same, there's plenty of scientists that believe the earth is 6k years old, plenty of geologists that think the great flood happened.
2. I can see that being very possible, 12 people really doesn't seem too hard.
Oh, and your theory still says that one unknown white guy killed the 12 people, are you saying whitey can do it but arab can't? Fucking racist.
3. "The news" fuck things up all the time, most are there purely to get viewers to watch the advertising.
4. Maybe it actually was a pissed off muslim who didn't want to fight/take part in killing his own people/people he may have supported.
Where's the motivation? Do you really think the government would try and cover it up just to get a few people pissed off at arabs? I can understand 9/11 but this guy was a US citizen, right?
Edit : Oh if you want to throw some more spin into it, maybe link it in with this, something to do with people being paid to assassinate soldiers to be able to get more support + security? finish it off as you wish, just make sure to include super secrets
http://news.bbc.co.uk/1/hi/uk/8341659.stm