I think the only people who want politics out of stories are those who don't understand what politics are. It's not possible...
Even in stories that don't even involve governments of any kind (which do exist), the politics of the author can easily become apparent through the choices they have the characters make, and their judgements of other characters.
At the end of the day, politics are ideas...specifically, ideas about how society should work, and how the world should be run. Government comes from those ideas, not the other way around...so in order to ensure that a story had zero political implications, you would have to remove those kinds of ideas entirely.
And even then, you might not succeed, because what is and isn't considered political is highly subjective. As many people have said before, some people's very existence in certain spaces can be considered political by others.
If the MC of your story is fat, disabled, neurodivergent, nonbinary, even merely female, there are people who will accuse you of trying to 'push an agenda', even if you honestly had no intention of doing so. All because their own worldview is being challenged by the suggestion of another, separate worldview.
All that is to say, it's really hard, if not impossible, to write a truly 'apolitical' work of fiction.
Although I DO understand what people mean when they say they don't like politics in their stories...they're uncomfortable with being preached at, or they're afraid the characters will be watered down into empty mouthpieces. Which does happen often; those are legit concerns.
But that's not the fault of politics, that's the fault of bad writers. =/ Often, it's the fault of writers who specifically don't understand politics themselves, and don't know how to think about it at a level of complexity beyond that of your average elementary school MLK Day activity sheet. 'X Y and Z happened, and that was wrong. Today, we should do A B and C instead'...that kind of oversimplicity will drag down any mature story, whether it's about politics or not.
And if you want my political opinion, I think the reason it's so prevalent is because of the demographic of professional writers, especially those who work in TV and film. I mean...it's still mostly straight, white, upper-class male. =/ People whose experience of any aspect of politics that doesn't cater specifically to them, consists of second-hand experiences at best, or literal elementary school activity sheets at worst.
People who are encouraged to care about other worldviews only as far as they have to to tap into the 'youth market', and no further.
And I think that until things begin to change in that respect, until creative control is given to writers of other backgrounds more often, politics in fiction will continue to be clunky, cringy, and embarrassing, and rather than risk being exposed to that in the search for something intelligent, many viewers will choose to avoid the subject altogether.