Arizona and defending borders

Arizona has now been told they don't have a right to defend their own borders! Is anyone else alarmed at this? Where does a Federal judge get the authority to strike down a soverign states laws concerning protection of its borders or inquiring about the legal status of the people who are within those borders? Do you not get asked for your papers (drivers licence) whenever you are stopped for a traffic violation? Are they not allowed to ask for your insurance papers too? Of course they are. If we are to follow the logic of the far left and our Federal government these too should be a violation of our civil rights, shouldn't they? I mean, No police officer has the right to harrass me or you about our right to drive a car, or our ability to insure ourselves in case of an accident. Right? Oh wait, thats right.... our ability to drive is called a privledge not a right. But, being here illegally is a right and not a privledge. Isn't it? It must be considering the logic. And purchasing insurance is is a forced mandate by States upon those who they deemed "good enough" to be allowed to operate a vehicle. But, i guess anyone is good enough to be in our country no matter how they got here. We definitly shouldn't be allowed to ask for any proof of legal staus. Thats just plain ridiculous! No problem with asking for insurance papers though. Of course not.