You realize this is a decision the courts made. Harris agreed to follow the law. That's it. And you know what -- these same laws were on the books under all four years Trump was President. See this document from the DoJ while Trump was President: https://www.justice.gov/d9/pages/attachments/2018/02/13/28_f...
A court saying something doesn't obligate everyone to agree that is the way it should be. That basic concept, applied to several other issues, explains most of what is happening now.
- Martin v. Boise. This was overturned, but for 6 years, insanity ruled.
- The general situation with asylum at the border. It's insane that millions of people can just walk across the border, turn themselves in to an immigration officer, tell a sad story (this included domestic violence according to the Biden administration...), get a court date ~10 years in the future, and just live your life in the US until then.
- Seeing clearly dangerous/crazy people with rap sheets a mile long, including violent offenses, released with slaps on the wrist for the 30th time, only to kill someone.
- Less insane but still questionable and a potent issue: various affirmative action laws/rulings, very "Harrison Bergeron"-esque diversity motivated laws/rulings.
If you force people to choose between the rule of law, and... that, then the rule of law might lose. That's what is happening now.
In a way it is revealing that Trump apologists' idea of an "insane Democrat policy" is sticking with existing law which affects almost nobody and they had no interest in discussing as part of their political platform, whilst the new President is pondering the idea of hitting Denmark with tariffs if they don't let him annex Greenland...