The signs that the "Occupy Duckburg" group are carrying don't paint them or their motivations in the best light. Yet, the next panel suggests these are "pleas for help" by which Scrooge should have been moved if he weren't such a greedy, heartless venture capitalist now. It's almost as if the writer and the artist were two different people with different takes on the situation.
More of a redemptive reading than a serious proposal that this is what Don Rosa meant, but in this scene's case, could it not be that what's going is that we're seeing the scene from Scrooge's perspective? The signs actually say reasonable things, but in Scrooge's mind they might as well be "Gimme!" and "Fund to Help the Lazy" and so on.
Regarding the "needle" quote, I'm pretty sure this line from Barks' "Turkey Shoot" is meant to be a reference to it as well:
(Also, minor nitpick: "The Red Mill" is maybe the earliest recorded instance of that catchphrase, but it probably existed before then. This book thinks it originated around 1900, probably in parodies of William Gillette's Sherlock Holmes play.)