From Papers, Please:

"What does an ID, any ID, do for security? The honest answer is 'not much'. If anything, relying on ID for security purposes actually makes things worse.

Showing ID only affects honest people. If you're dishonest, you can obtain false documents or steal the identity of an honest person.

If a 19 year-old college student can get a fake ID to drink, why couldn't a bad person get one, too? And no matter how sophisticated the security embedded into the ID, wouldn't a well-financed terrorist be able to falsify that, too? The answer to both questions is obviously 'yes'. "