They think we're so stupid sometimes.
Agreed.
Now, it is entirely possible that these 11 towelheads wanted to come to the US for some partying and to hang out. We can't rule that out.
But given the problems that this demographic (military-age Muslim males) has brought to the world in recent years, it'd be stupid for the govt to assume they're not a threat.
There, fixed it.
If they REALLY want to catch these guys, they should put out a news story with names, photos, and that they are wanted "potential terrorists" and see how long it takes for them to be found. If someone goes ahead and pops a cap in them, oops. Better that than another 9-11. I believe they are up to no good. Why would 11 Muslim men go missing in the U.S.? Hmmmm.