Couple points about the Boy Scouts
First, they're a private organization, not a profession. Employing litmus tests on who can attend graduate school (affecting careers) is a wee bit more serious than placing restrictions on who can be a Boy Scout or a Scoutmaster.
Second, the Boy Scouts have been successfully sued more than once when a Scoutmaster molests a kid. No, that doesn't mean that all homosexuals are child molesters, but it does given them reason to be concerned about kids' safety. It isn't unreasonable to restrict who can be a Scoutmaster. As for gay scouts themselves, that's not as clear-cut.