This is a public note, but directed at the current administration, so reading it as a description of what is or is not moral is completely missing the point. This note is saying (1) we refuse to be used in this way, and (2) we are going to use "mass surveillance of US citizens" as our defensive line because it is at least backed by Constitutional arguments. Those same arguments ought to apply more broadly, but attempts to use them that way have already been trampled on and so would only weaken the arguments as a defense.

If it helps: refusing to tune Claude for domestic surveillance will also enable refusing to do the same for other surveillance, because they can make the honest argument that most things you'd do to improve Claude for any mass surveillance will also assist in domestic mass surveillance.