Exactly, behavior like this should be cause for some serious grief to these guys, deportation if they're not citizens. Imagine if they caught a group casing a bank, taking photos of the vault doors, trying to break through the wall behind a mirror. It's even worse when an airplane full of people is involved.
Here's more information about the Syrian musicians that were on that flight....
http://www.nationalreview.com/comment/taylor200407211921.asp