"Anyway, I'm still trying to understand the reaction in which someone decides to leave scouting, not because their CO has lost its ability to discriminate, but because OTHERS have gained the freedom to choose NOT to discriminate. I just don't get it. Why does one person NOT want another to have the same freedom that THEY have?"
It isn't as simple as that. Troops don't exist in isolation. Removing the ban means the possibility of gay leaders at summer camp, district events, OA events, etc.
If a parent doesn't want their precious darling camping out in the woods with a gay leader,