You don't get to ignore due process just because crimes are alleged. That's the whole fucking point of due process - to ascertain exactly what has happened and not just take some thug's word for it when they want to boost their arrest numbers.
USA? I don't see what this has to do with authoritarianism.
And if you look at the facts of what America is doing in the world, how many wars it has started and how many wars it supports in the last 50 years, and how many MILLIONS of INNOCENT people it has KILLED, RAPED and STARVED TO DEATH, then in comparison to this, sending a few people to El Salvador is non-existing problem, and big luck for this people, because they were dealing with USA and got away practically untouched. Gulag in El Salvador? Practically a weekend trip compared to what USA did to MILLIONS of non-usa-citizen around the globe.