I think the
claim underneath the comment above is that immigration laws have been not been enforced or unevenly been enforced. On principle, advocating for a consistent application of the law seems sensible. This goes along with advocating for the rule of law.
Let's talk about justice, too. Many people believe true justice transcends any particular instantiation of the law at any particular point in time. If so, advocating for the consistent application of all laws can only be truly just if the laws are just.
Look at present circumstances. Reporting has shown that Trump is doing extraordinary rendition: removing people without due process. And not bringing them home after admitting the mistake. Once this reality is factored in, where is the justice in consistently applying a law in order to extrajudicially render a person?
Clearly, the Trump administration has a double standard regarding the rule of law and the role of the judiciary.
Note: this comment surely needs another draft, but I'm running out of time. I welcome all criticism.
P.S. At the risk of surfacing even more complexity, even if a system were to consistently apply one set of criteria, such as ICE's authority to arrest, it is likely that other criteria apply; namely, allocating personnel in a way that best carries out their overall mission. It is my (educated) guess that practical concerns (such as resource limitations) is one of the reasons courts give administrative agencies considerable flexibility in what laws they enforce.