Earlier quoted context omitted.
It is still a crime even in Brazil and Argentina. Whether or not it's enforced and/or the degree of exceptions allowed, are another issue. For instance obviously illegal immigration was treated radically different during the previous administration, but the laws remain overwhelmingly the same. For instance the most controversial issue in contemporary times is deportation without trial. That's called expedited removal…
Obama and to a lesser extent Biden weren't soft on illegal immigration, but they did two things that differ from the current administration: * They followed the law. Crackdowns like the one Trump is taking are only possible if you treat law as a fluid concept and ignore judges consistently. A democrat is never going to get around that, and yes, laws can be changed, but notice how Trump isn't even bothering to do that…
So for an example from the previous administration, they wanted race based admissions for colleges. That is obviously illegal and unconstitutional. After the Supreme Court predictably ruled against them, they worked to circumvent their ruling in various ways including in a 'Dear Colleagues' letter [1] offering guidance on ways universities could achieve a racial quota while remaining within the bounds of the law, effectively laying out a proposed blueprint for intentional Disparate Impact [2], which is *drum roll* also illegal.
The main difference you're seeing in contemporary times is the way the media is spinning everything, intentionally looking to foment conflict and radicalism. We live in amoral times and so working around the judges and legal systems is framed primarily in terms of who's doing it.
[1] - https://web.archive.org/web/20241127174625/https://www.ed.go...