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I definitely take your point. I'm actually not super cynical in terms of the debate between attempting change from "inside" vs "outside" -- in other words the risk that "it changes you more than you change it" exists in both methods, and I don't want to demonize either choice because I think good people can participate in both ways. I'm also not cynical about the potential for change, in a vacuum. That pyramid is in no way a permanent natural truth.
Where I am cynical, of course, is time. We don't have enough, due to our just-beyond-the-horizon climate catastrophes. As a species we've already been murdered (or is it suicide?). It'd be nice for a generation or two to maximize quality of life for almost everyone before the end though, if just to have done it.