Hi, this is my first post!
I can't say I know much on the logistics of this topic, I can only speak on the morality of the situation - or lack thereof. I apologize beforehand if I'm missing anything of importance or if my sleep deprived mind scrambles things up.
In debates such as this, we must consider all sides of the argument. On one hand, there is good reason to get rid of illegal immigrants - to my understanding, most countries do as illegal immigration can be quite problematic for both the country of immigration and the citizens of said country (think of taxes and potential job loss). On the other hand, we must consider the reason behind said immigration, even if illegal. Mexico isn't the best of countries to live in, especially if you're of low social standing. Not everyone coming from Mexico is a dog eating rapist, some of them have legitimate reasons to come here, despite what others think of it (family members like fathers or older brothers will come here to work and then go back to Mexico to provide for their families because we have a better economy than they do).
Circumstance and consequence aside, we must also take into account what is happening to these illegal immigrants. Logically speaking, it'd make sense to send them back to Mexico, but then you have the argument that they may just come back. The next best thing then would be to find a way to keep them out then. This is why they are sent to a foreign prison. However, accounts of the prison's in El Salvador aren't flattering in the slightest, including "cases of torture, ill-treatment, incommunicado detention, severe violations of due process and inhumane conditions, such as lack of access to adequate healthcare and food", according to a Human Rights Watch report on the matter. We must also take into account, not everyone sent to CECOT is necessarily an illegal immigrant, there are legal citizens there - some of them being children (by the way, CECOT is technically an adult prison).
With matters of what is happening out of the way, what about what's not happening? First of all, people sent there wrongly are not being sent back. We are not getting much - if any - information on all that going on at CECOT. There's also a certain amount of double standard here. There are illegal immigrants that aren't from Mexico, South America, and Central America. There are a good 500,000 European illegal immigrants that aren't getting rounded up alongside their Hispanic counterparts.
I try to keep in mind that every situation has multiple sides, multiple faces. We each have a choice to pick a side to look at. What I've found in my analysis of this situation is that the only way people accept what's going on is they either don't know the full scope of the situation (understandable, there are people who don't pay attention to stuff like this because they find it depressing - there are also those who watch false news sources without even realizing), or they are informed and actively choose to ignore the warning signs and truth.
Something like this though, at the end of the day, is generally viewed as wrong and immoral. At the very least it leaves a bad taste in your mouth. If you know your history, you know what this looks like - and there are differences, sure, but this goes a bit too far to be looked at as something completely different than what the Nazis in the early days of and before the camps. Reasoning may be different, and there aren't mass killings - yet. But that doesn't make it right.
HRW report