Look, I understand the dilemma of the writers: they can't depict the UNSC as the bad guys, but in this way the rebels seem a bunch of delusional fools who don't even know why they are fighting.
I mean, that's what the Insurrectionists are in canon.
They're not the Belters but an alliance of pirates, terrorists, and wannabe dictators.
I see it as a parallel to third-world countries that are major oil suppliers that the west relies on, yet are dirt poor. So they want to see the benefits of the deuterium that they're selling instead of all the profits going to the colonial dictator.
Which is actually a very apt critique. Kwan is talking about how disgusting the UNSC is and how evil they are but according to her is the one who has all the money from the deterium.
"Deterium money."