I suspect that they started admitting perverts and girls when the organization was clearly dying off; in my area (northeastern NJ) there is little enthusiasm for scouting, yet old troops have a lot of land.
This is a the result of demographics; the “replacement Americans” are very leery about sending their children overnight with unrelated adults - and most of the Americans themselves have no children to send.
The decision to start girl troops perhaps, but the homosexual allowance is what cost them millions of members.. which is why they are going bankrupt.
Mormons pulled out once they made that announcement, which cost them a very large segment of their membership.. something like 2-3 million members if memory serves.
This was driven by one guy on the national council, can’t remember who it was, but he destroyed the scouts....