As a general rule, private parties are free to request whatever sort of identification they want, just as they are free to demand or negotiate other contract terms. To suggest that government should require voter ID because some private businesses do so on their own accord is silly. It would be like noting that many bank account holders are required to agree to arbitrate disputes with their banks, and therefore suggesting that the court system be scrapped. Or, for that matter, it is like observing that one must have a credit card to make online purchases or conduct online transactions, and therefore a credit card must be required to vote.
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The remaining examples of arguments in this section are based on requirements of law, and therefore deserve special consideration: