Yeah, I think what people are failing to understand is that there are and always have been varying levels of due process of law.
The highest level of due process is in a criminal case and failure to deliver it generally voids any conviction. And that means basically indulging every procedure and inference in favor of the defendant.
Civil due process basically means notice and a hearing. You don't get it, you get a do-over, not nullification of what just happened.
Look at the judgments of the Immigration Court and Board of Immigration Appeals. https://www.courtlistener.com/docket/69777799/11/1/abrego-garcia-v-noem/ and https://www.courtlistener.com/docket/69777799/11/2/abrego-garcia-v-noem/
Now, Abrego Garcia did have counsel, the same one he has now, but without benefit of some of the evidence he has now.
Giving him due process, and the others, may not change the outcome much.
Also, I'm not sure any district court anywhere is going to directly order Trump to bring him back. They can maybe sniff all around it, and SCOTUS isn't going to let them do much more. So, yeah, convincing Trump somehow it's in his interest to bring him back should be a consideration.