Do booze shops in the US store peoples id's after they've flashed them (pun intended)?
Now, I still hate the idea that any corporation is storing my ID, but it's not every Tom Dicken' Harry porn site you might be viewing.
We know that very few organizations are capable of effectively controlling confidential information that they're legally bound to keep confidential. Requiring things that are going to lead to large stores of ID images is asking for trouble.
When you show your ID in a store, the clerk generally doesn't retain a copy of it, and if they do, it's apparent because they take the card to scan it... regardless, they can't take the scanned copy and present it at another store, because the other store will detect that it's not an original.
I agree with you that systems that store those IDs are ticking bombs.