Why would he have been, he wasn't a foreign national trying to get into our country? The vast majority of terrorist attacks worldwide are by Muslims sir. Stands to reason that you should be very careful about letting large numbers of them in, especially since you have no way of truly knowing who they are. And if they're coming from Muslim countries, as opposed to Muslims born and raised here, they are coming out of cultures that bear little resemblance to ours. Makes assimilation that much more difficult.