What is the important thing Marcus realizes about most of the folks who are on Treasure Island with him? How does it prove Jolu’s (Jose-Luis Torrez) earlier fears to be true?

Marcus realizes that everyone at the prison is tortured and tormented in some way. Ange has been drugged because she wouldn't stop screaming. Darryl's curled up naked in the back of his cell. Jolu had once said that people who are different: people who rebel against the norm are treated that way. Jolu would know because he isn't white.

"the way the DHS is treating you? The law in this country has always been like that for [non-white people]."