Again everyone is going to believe what the media is telling them. From what it seems like, they are arresting people that have no legal papers to be here or have comitted crimes. Either way, currently they should be locked up. They will all have a chance to stand a fair trial. If it is true that there were delays in processing their visas (even if it is a delay, they currently have NO papers), the courts will see that and let them go. (This is the state where they let a killer of 2 go free and thought the pledge of allegiance should have god taken out of it) People are arrested and locked up on a daily basis by mistake all the time-you dont see them making a big deal out of it. Our legal system is one of the best, if they are innocent, they will be let go. But the others that have expired visas and shouldnt be here-send them away.
A friend of mine was locked up by accident recently because a mistake. They let him go and he has no beef with them. All of those who are locked up will go and have a fair tral. Its not like their are being immediatly deported without proper due process.
And out of the 500 or 100 people they detained...say they find one person with a link to al queda and were able to expose another Sept 11th type attack...would it then be worth it in your eyes or the thousands of peoples lives that would be saved?