EU citizens have a Fundamental RIGHT to free movement between member
nations.[1] Prior to Brexit, a citizen of Holland could live in the UK or a
Citizen of the UK could live in Belgium. You would still have to
comply with local registration laws (e.g., Belgium), but they couldn't
deport an EU citizen.
Brexit changed that and removed a right guaranteed by Treaties.
With Deferred Action for Childhood Arrivals, DACA, the people in question are "unlawfully present", which means they
are non-compliant with immigration procedures. Most nations will deport
a non-citizen who is not compliant with immigration procedures.
Deportation in and of itself can create consequences for international travel/movement.
But, there is a big difference between having a right to reside in a
nation taken away from you and being deported because you DO NOT HAVE a
right to be in the nation.
While it may create a sad tale, most
nations do not show the same consideration the US has in trying to
normalise people who have been "unlawfully present". There is no right
for people to be unlawfully present to become citizens.
It is not racism, it is international law.
Footnotes:
[1] Article 3(2) of the Treaty on European Union (TEU); Article 21 of the
Treaty on the Functioning of the European Union (TFEU); Titles IV and
V TFEU; Article 45 of the Charter of Fundamental Rights of the European
Union.
