The Khmer Rouge were defended by the US and got up to $215 million in weapons from them: https://en.wikipedia.org/wiki/Allegations_of_United_States_support_for_the_Khmer_Rouge

lol why is the last level beyond ???, the last level statement is just objectively true.

TFW you don't take the black book at face value

you can find them but they're fringe. Usually weirdos who are just dipping their toes in marxism and think the khmer rouge must have been lied about, and then outright weirdo agendaposters there to wreck communism with their terrible takes. You can spot the latter because they're historical revisionists outright, like cherry-picking quotes and parts of documents that support their narrative and usually nothing more substantial to offer if you press them.

I remember seeing like maybe two or three over a course of several years back on reddit.

And that is actually very telling, even on a website where you'll find tons of people who have latched on to the most baby-brained ideologies possible, many of which only really exist in vidyagames, it's exeedingly rare to come across anyone who has anything positive to say about the KR at all.

Some MLMs did even after the news got out, most notably some Gonzalo supporters. But even there not a lot would support him once he threw in with the monarchy.

The state department did once upon a time, but that's not a tale the libs will tell you

Some of the new left intellectuals did, such as infamously Noam Chomsky, or Samir Amin.

Supposedly a few exist. I've never seen one either.