Open Source software is also political, it's just a political position you agree with. (It's a position I also agree with, fwiw.) Let's not pretend that the GPL is free of politics.
What partisan pretensions are on offer with the GPL are unclear.
While a FSF member for decades, I take a syncretic view that the GPL is a crucial point on the licensing spectrum, and that economic value is maximized when there are products available across that spectrum for people to choose and use at will.
I guess, if we squint, this might be something of a political position, perhaps a libertarian one.
The FSF is very concerned with who has power within the relationship of software author and user -- namely that users should retain the power to redistribute and edit their software.
If someone is trying to ensure a community retains power or someone is trying to ensure a community loses access to power, that's politics too.