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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Really depends on your troop leader. It was by far one of the cheapest extracurriculars we did with our kids. We had a good troop leader and most of the money raised from the cookies went to excursions for the girls. They also allow trans girls in now. Anyone who is living as a girl full time. Not sure where that leaves enby kids, but Iโd imagine the specifics are left up to the specific people making that call.