Also, The Girl Scouts explicitly rejected a large donation from an anti-trans organization: https://www.seattlemet.com/news-and-city-life/2015/06/donor-says-girl-scouts-can-t-use-100k-gift-for-transgender-girls
Girl Scouting is for all girls. Trans girls are girls, so they belong in Girl Scouts.
Yeah one troop could be very progressive and nice but the troop over in the next park might be very conservative and close minded. It’s pretty self-contained like you said.