> (an affront to Irish sovereignty, but that's another matter
I’ll bite. Why do you think it’s an affront to their sovereignty? It’s entirely voluntary and it’s something the Dublin airport (and the dozens of other airports in Canada) actively seek out to get direct access to the domestic side in the US.
The US does not force any airports into these arrangements.
The programme is there for the convenience of the US. Would they allow Ireland to operate a corresponding facility on US soil?
(The popularity of that airport for CIA torture flights also doesn't help the case, even if not directly linked)
I think it's absurd to have US immigration policy enforcement on Irish soil (I suppose there's a diplomatic carve-out for whether the post-immigration area is "US soil" or whatever, but still).
As said policies become increasingly inhumane I think Ireland should consider removing this arrangement. But you are right, Dublin Airport themselves do benefit since it makes them more attractive, especially as a transfer airport for people going to the US from Europe.