Based on what I've seen, it appears like more of a self-hatred problem than it is people outside of the imperial core focusing overly much on the individuals who inhabit it.
I think there are some misconceptions though, which contribute to a sense of near-hopelessness in reference to the imperial core. Such as:
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"The empire living off the exploitation of others necessarily means the people living in it are well off and so the rest of the world has to do a revolution before they would ever be motivated to." On inspection, many of them are increasingly not well off and some are part of a marginalized group on top of that (such as black people in the US).
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"People in the US have never really tried." The US is for sure the most virulent anti-communist there is in the world and it derives from a genocidal colonial project that transformed into a global imperial one. After saying that, it's easy to stop and go "look at how it (seemingly) is now, a handful of weak reformists doing nothing." But the one feeds into the other. The US had the red scare (well had, more like has ongoing) which vilified anything even slightly "leftist." The Black Panther Party tried to build a vanguard party with dual power and faced assassination, imprisonment, vilification, infiltration, and so on. Earlier in its history, there's the Civil War, which I won't romanticize and pretend was some grand liberation struggle the white power brokers were partaking in, but it is important to note because post-Civil-War did not repress or dismantle the confederacy side properly and they went on to do things like romanticize slavery via The United Daughters of the Confederacy material pushed in schools. So it's not just that USians (some way more than others) benefit materially from imperialism, it's also that it has faced enormous internal political repression and a kind of ongoing aggravated internal state between the slave owner faction and the reform faction (and what those factions developed into later on). And it's not only "non-white" who have ever tried anything. Eugene Debs is a notable socialist name, one who ran for president while being imprisoned over an anti-war speech. The Battle of Blair Mountain is a notable event of how the US state was willing to join in on waging class war against its own people (white included).
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"It has been this way so far, so it will keep being this way." Change requires transformation, but it is possible. However, it also requires assessment of where things are going wrong and how to do different in a way that will work. When CriticalResist made the point some time back that so many imperial core parties are "ossified and failures" (I believe was the wording), I had an initial desire to push back. I think because I was concerned it was being too demoralizing a picture of ongoing struggle. But we do have to be sober about real failures and the goal of a vanguard party is not to figure out how to cozy up and co-exist with imperialism while doing some token opposition in the margins. So it's more about movement than it is about judgment. People are going to judge and we will too, but at the end of the day, things are moving. Question is where do they get moved to.