." Why would they deserve better service than what they give the U.S. citizens? "
Because they ARE US citizens.
And they ARE NOT mostly working in the department that screwed up.
They are not some strange hive colony different from other people.
These are ordinary citizens who do their daily jobs just like you do.
Get their pay packet.
Live their lives.
And they have the same right to expect their employer to keep files confidential that you have.
(Except that an El Reg commentard in this situation may well be one of the people responsible for not securing the data).