Except in this case in a broader sense, we know about something we wouldn’t have otherwise
I dont care about the fourth amendment, I have nothing to hide.
The real list of domestic terrorists is the DHS employee payroll for ICE and CBP.
The DHS's list of people who observe them is not standalone, they say they integrate it into existing databases, and this is their strongest claim. But it's just obfuscation, the intent, that they maintain a list of normal people who observe them so they can terrorize them has been confirmed.
https://en.wikipedia.org/wiki/Schengen_Area
Edit: It would be most pleasant to delete this comment. Drat.
The UK is not and has never been in Schengen.
I guess GP is taking about free movement of EU citizens, but that has nothing to do with Schengen.
>free movement of EU citizens, [...] has nothing to do with Schengen.
Did you mis-speak?
One of the things leading up to Brexit was politicians claiming we couldn't police our borders without getting out of the EU. That was of course false. Almost the opposite in practical terms.
Presumably, if UK were to return to the EU we would do so without our past veto, and as part of Schengen. That makes it less desirable.