I still think it is because they can suspend their disbelief about the existence of fairies, knowing in their heart of hearts that they are not real -- but they can't disbelieve in lesbians, much as they probably say that they do.

So - those talking probably profess that lesbians don't exist, but in their heart of hearts, are afraid they do.

I understand that the James Bond movie with the Space shuttle was considered more unrealistic for the use of the space shuttle as a setting than for all the other fantastic stuff he did. But the space shuttle does exist, and those other mad inventions did not.