The GNU Project supports the cause of software freedom, that the users of computing should have control of their computing activities. This requires that they have control of their software that does those activities, which in turn requires that they do these activities with free software and have the possibility of replacing any shared copies with their own copies.
It also supports basic human rights in computing including use of the internet; opposing censorship, for instance.
A GNU package should not seriously advocate any other political causes. Not that the GNU Project opposes those other causes. Rather, it is neutral on them, and GNU packages should be neutral too.