Can't say it better than the article linked above.
If memory serves, weren't many of the 9/11 hijackers also here illegally? I think I remember something about some of them overstaying their student visas, but I could be wrong.
When Elvis and Dritan Duka, two of the three brothers arrested on terrorism charges in Fort Dix, were kids, they were neighborhood bullies. When they got a little older, they became drug dealers.
How do I know? They grew up in my neighborhood, my brother and his friends used to brawl with them on a fairly regular basis. My brother's best friend's mom was friends with their mom. Then they moved to New Jersey and became Jihadis. Of all possible paths for the Duka kids, that one didn't seem the most likely.
They've been here since they were kids, illegally it turns out, lived American lives, went to our public schools, and then decided to try and kill some of our troops. I don't know that I'll ever get used to this world.
And people wonder why people like me are so up in arms about illegal immigration.
Hat Tip: Wizbang!