Clearly, you don't understand.
(Please choose one from below as a response.)
1. There are so many IDs, we can't be expected to know them all (much less accept them).
2. Don't you have a Drivers License? Everyone has a Drivers License.
3. We are a young agency. These things take time. So, until we all know what a NEXUS card is, you need to produce something else, like a Passport Card.
4. Sorry, we don't accept the NEXUS card.
5. Sorry, we don't accept the Passport Card.
6. They haven't started that program yet.
7. Don't you have a Passport? Everyone has a Passport.
8. The TSA website is out of date.
9. The SOP is out of date.
10. We're going to have to give you a secondary and search your bag.