What? Can you cite any laws legally barring people for requiring ID for a business transaction or to access private property? I've honestly never heard of such a thing. Obviously if a private person says "I want to see your ID for access or before completing this transaction" you may legally refuse, and they cannot arrest you or anything. But they can then in turn refuse to complete the transaction.
You've no right to access private property even with ID, as TFA illustrates. ID or no ID, the private property owner can eject you if they wish (unless their ejection is based solely on your membership in a protected class).
I'm not sure where your question comes from. Of course any private property owner can reject you for any reason, including failure to ID. But that's nothing to do with ID.
It comes from your assertion that "Private parties can't demand ID." That was your claim. I'm saying that as far as I know private parties absolutely CAN demand ID. Including for "routine transactions". And if you don't cooperate then you don't get to do the transaction.
You seem to have just completely reversed yourself with this post so now in turn I'm not clear on what your first one was for. If you were somehow conflating "demand" with criminal penalties or force then that's a weird reading, and also this entire discussion is purely about a business transaction. They didn't arrest her, they "jsut" didn't honor her ticket and booted her, which is what people are (reasonably IMO) concerned/upset about. But refusing to show ID wouldn't have helped with that quite the contrary, even places with zero such tech may require identity verification for a transaction and ID is the only widely existing low friction way to do that.
What? Can you cite any laws legally barring people for requiring ID for a business transaction or to access private property? I've honestly never heard of such a thing. Obviously if a private person says "I want to see your ID for access or before completing this transaction" you may legally refuse, and they cannot arrest you or anything. But they can then in turn refuse to complete the transaction.