As the only true lib on hexursine:

https://youtu.be/2xsbt3a7K-8

Around 19 minutes in he starts talking about how his “dream became a nightmare” and mentions another quote from someone else who said “We may have integrated a burning house.” He mentions that many people don’t have the same hopes they did the decade prior when there was a push to end Jim Crow because people are still living in poor economic conditions. He starts laying out how civil rights up to that point had been supported because it “didn’t cost America anything.” But the push for real equality would require economic changes and that’s where he was running into the most resistance.

You can see how he had come around to socialism as socialism was the answer to racism, militarism, and poverty. Marching and speeches wouldn’t be enough. The US would need to revolutionize its economy if it wanted to get serious about equality. He points out how white, European settlers were given land out west, while former slaves were thrown to the wind. So it’s not like the US was unable to create a society based on equality, it just didn’t want to. People only supported civil rights up to that point because of the sheer brutality of racism, not necessarily because they were against racism.

He was assassinated a few months after this interview AFAIK.