They have not been "proven" to do that, and it's certainly up for debate. The very article you cite -- which is very far from a theorem or proof of anything at

They have not been "proven" to do that, and it's certainly up for debate. The very article you cite -- which is very far from a theorem or proof of anything at all -- points out that a very small percent of the population is without ID. The U.S. is not special, and frankly your claim that this is not up for debate is indicative of a type of intransigence and refusal to both face facts and learn from the success of other nations in this area. So participate in the debate or it will go on without you. Voter Id are laws are coming, and the debate is just getting louder -- it's time the U.S. joins the modern world and reforms the entire system from top to bottom, and including IDs is a basic building block of building a rational voting system that is based on standardization and chain of custody principles, starting with proof that the person who is voting has a right to do so.