It's not an accident! It was purposefully done!
It was a conspiracy of sorts enabled by corporate blackmail against the BSA.
The BSA got addicted to the corporate sponsorships, granted board member status to corporate executives who were/are progressives and the rest is history.
The BSA has gone full PC, permitting adult homosexuals to be leaders, permitting transgenders to join, and now this...they'll lose patronage for a number of years and then probably stabilize like scouting in Canada at a fraction of its previous membership, the program may survive but will never be the same.
For those interested, Trail Life USA offers a very similar program founded upon Christian values. It's not for everyone to be sure, but it's an alternative.
http://www.traillifeusa.com/