I have a general feeling that they're bad (the org, not the individual children lmao) but am fuzzy on the details of why. It's generally agreed among leftists that it's child labor right? And that they love teaching little kids that capitalism = cool and good. I've got a niece in girl scouts and I'd just like some more concrete examples and reasons not to support them so that my family understands that I'm not just being cheap... although yeah ok I admit it the shrinkflation over the years is one of the reasons I don't give them money, fine.
Or uuuuuh if you think they're good actually then explain for the class pls. Make me feel bad about buying knockoff treats for a third of the price and then not donating the difference. 
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A few years ago, there was a story of a girl scout and her mom setting up a table outside a dispensary selling cookies and absolutely killing it. Not only did they deserve some sort of innovation award, but it taught the whole organization how to tap into an unmet need.