I am asking Goom, who wanted to argue on legal terms which are tbh very clear. Yes, giving people due process is the hill the justice system wants to die on, it depends on it.
As a side note, there a multiple Venezuelans currently in El Salvador who also had no trial and were in the asylum process (aka trying to stay in the US "the legal way"), so does that make you feel differently? See J.G.G v. Trump.
It's a moot point, he is no longer in America's jurisdiction. It is profoundly strange to ask El Salvador for custody of their own citizen.
The asylum process has been thoroughly co-opted to facilitate defacto illegal migration into the United States. The overwhelming majority of cases have no legal merit, they're made singularly to secure entry into the United States, where subsequent Democratic administrations have instructed ICE to effectively ignore them in flagrant violation of established immigration law.
As for the Venezuelans themselves, I agree with the Supreme Court. They should receive a hearing, post which they can be sent to El Salvador.