Andry Romero, a gay makeup artist sent to El Salvador, sobbing and praying as guards shave his head.

The erasure of how people keep and style their hair is a part of every genocide. They come up with ways to justify it every time, excuses for why it's necessary. But the real point is to erase a person's identity and their connection to their culture.

They do this in US prisons as well, for that very same reason.
- Source? I never had "hygeine" or grooming requirements in prison. I did in the Marines though.
  
  Edit: It seems the shitty state prisons require it for "lice"....
  
  https://www.grunge.com/1221963/why-some-inmates-have-to-shave-their-heads-before-entering-prison/
60 minutes interviewed the photojournalist Philip Holsinger. He says as much when discussing the pictures of them bound, shaved and wearing all white.

Genuinely so disturbing that people are cheering this on, both in general and in the context of these folks being just regular people.

It’s also sad this happened in El Salvador. Trading individual rights for broad sweeps based on stereotypes and vibes is NOT an acceptable practice for either country.
USA is a fascist genocidal empire. Yeah it's disturbing. But what else do you expect?

I'm sure if you asked a holocaust survivor what the procedure for entering Dachau or Auschwitz was like it would be very similar.

Unsurprising, since CECOT isn't like a concentration camp, it is a concentration camp.

It's a slave prison right? What's to stop us from crowdfunding and buying them back? Bringing them home?

It's a concentration camp. And yes, you can probably pay for people to get out of there.
- Given that El Salvador has the highest imprisomnent rate per capita after North Korea (and since NK is super secretive, they might have passed it by without us knowing), and various other inhumane laws, I would definitely prefer if nobody paid that government even a penny.
  
  I would pay (if I had enough pennies) for opposition to get Nayib Bukele out of power. He's their version of Trump, a democratically elected authoritarian.
  
  Sadly, unlike with Duterte (from the Philippines), there is currently no international interest in getting him to a court - which he likely has already earned by now.
What's to stop us from crowdfunding and buying them back? Bringing them home?

I'd guess it's mainly just the lack of concern from people who can afford that, but also given that the perpetrators face no consequences whatsoever it's kind of scary to think how this could get even worse if they found out it's profitable.
The feeling is justified, but it they realize they can get 100K ransom for every person they kidnap, regardless of that person criminal background, how long until they start sending people just for that?

Guantanamo was/is a stain, but this somehow it's even worse

Just curious, but why is there a camera/photographer there at that moment? I this to show how tough the "criminals" are treated?

Yep, it was a PR stunt to show how tough they are to "criminals".