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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Not at all, its a pretty common thing in most cultures.
Shit, I was in cub scouts and boy scouts and for the most part, we just hung out did some guided activity for a while until we became "ungovernable" and were allowed to go play elsewhere.
Outside of the occasional "fundraiser" and the Boy Scout Jamboree (which, I know I've been to, but have almost no specific memories of) it was just a bunch of kids being kids and our parents being able to talk to other adults for a while.