Yes.
I was once a lefty and I can tell you that a process is involved which begins with acquiring the ability to step outside of your country and view it from afar, the process gradually provides one with an extremely seductive feeling of belonging, also a sense of superiority over those who are not so enlightened, and evolves to the point where your country is THE ENEMY, in any and all instances.
These people (celebrities) feel as if they owe nothing to America in general or capitalism in particular, because they become so filled with their own importance that they believe they would be exalted in ANY system, in ANY country.
Malignant narcissism and patriotism simply cannot coexist within the same...small...brain.
I was a lefty once too, and let me applaud your analysis, but add one tiny suggestion. In my experience, it's not a matter of acquiring the ability to step outside the country to view it from afar, it comes from already feeling like a misfit in your own culture. Such people then, to protect the ego, decides that if they doesn't fit in it must be the fault of their culture, because otherwise they'll have to accept that there is something odd or wrong about THEM.
Of course, they never fit in anywhere, but living as an ex-patriot gives them the excuse as to why they don't fit in: they are ex-patriots, and they are regarded as rather exotic and special. This also appeals to the massive yet insecure ego of this particular breed of narcissist.