system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do lots of places only accept a passport or a driving license as identification when some adults don't have either?
gpt
Generally, the legal risk of selling to the wrong person is much higher than the risk of alienating the few customers that don't have either of these things. 

For example, alcohol. Serving to someone that's under age in Texas can get you thousands of dollars in fines, and can get the business tens of thousands in fines or even a potential loss of liquor license, which pretty much shuts down the business.

Compare this to the risk of pissing off a customer that doesn't have the time or money to get a government issued ID, which costs like $25. That person is never going to be your best customer, so there isn't a whole lot of incentive to make a risky exception for them.