WHATEVER THE ORIGINAL AUTHORS' REASONS FOR CHOOSING THE GPL (sic), it doesn't change the situation that one might not be happy for a project they want to use being in GPL -- including people who don't intend to make it proprietary, but who prefer BSD licenses nevertheless.

You've just outlined the choice that the person has. Admittedly, I wouldn't use the GPL for libraries, I've started using the MPLv2 for stuff like that. I don't really agree with the common reading of the combined work clause in the GPL wrt libraries (a work that uses a library's API shouldn't be bound by the copyleft of the GPL IMO -- but as Oracle has proven, APIs appear to be copyrightable).

> WHATEVER THE ORIGINAL AUTHORS' REASONS FOR CHOOSING THE GPL (sic), it doesn't change the situation that one might not be happy for a project they want to use being in GPL -- including people who don't intend to make it proprietary, but who prefer BSD licenses nevertheless.

BSD licenses allow distributors of the software to make it proprietary. That was clearly a more important problem to the author and community of the software than allowing GPL-incompatible projects to use the code. It's a fundamentally ethical decision, which you may disagree with if you follow the open source (as opposed to free software) philosophy.

The part you seem to avoid agreeing with is that it can often be a really annoying choice to have to make. Isn't everybody entitled to be annoyed when they only have one so-called choice? (Like having to move or use slower alternatives in order to get away from Comcast as your ISP.)

Continually pointing out that there is technically a choice doesn't really help anyone who feels bitten by their lack of choices.