I'm not trying to convince you that illegal immigrants shouldn't be deported. What I would like to convince you is that any time the government takes action against a person, the government should have to prove their case in open court, and the person should have a fair chance to defend themselves.
Is this particular person MS-13? Did he have a legal right to be here? You don't know. None of us do, not for sure.
10 years ago, the idea that the government could sweep people off the streets and deliver them to a foreign prison with no trial or recourse would have been seen as absurd by every part of the political spectrum.