So Mexico really isn't a great entry point for a dark-skinned Arab, unless he speaks Spanish with a flawless accent (though given the variety of Spanish accents, that's not necessarily that hard.)
>I also disagree that "small attacks aren't enough". If you and 9 of your friends coordinate to roll grenades into 10 elementary schools in 10 different cities, I can assure you that you'd make headlines, and bring daily life to a standstill as parents refused to send their children to school.
If you've managed to coordinate 10 different homicidal suicidal maniacs in 10 different cities to kill a bunch of people on the exact same day (and somehow managed to find 10 who won't tell anyone anything that suggests they're doing something suspicious,) aside from the fact that that is very hard, you've definitely evolved to a large-scale attack.