and you would be wrong. 
My sister works for American Airlines in Phoenix. She is friends with a number of the TSA agents. According to them, they regularly have ppl trying to get on the airplanes with unusual items. Oddly, these items shaped like guns and knives and hidden in luggage in unusual locations. 
And yes, they are all middle easterners to southern Asians; presumed muslimes. 

Now, you may not care whether it is true or not, But I have talked to a few TSA agents here ( met several at the dog park ), and they tell a similar tale. Basically, these ppl are stopping future attacks, which would likely happen if they go away.