It does not exist in a vacuum no matter how hard you try to put it there.
The workplace is a place for getting work done. Arguing about politics is not getting work done. Unless your workplace is Congress, I guess, although they seem to argue a lot but don't get any work done.
When I see people saying things like "everything is political so politics is part of the workplace", I translate that as "I would rather argue about politics than be productive". Or, alternatively, "I would rather argue about how other people should use their time and energy and money, than actually do the hard work of using my own".
Trump making it harder for h1bs to get citizenship will impact how h1b workers feel in the company.
Supreme Court deciding on if abortion should remain legal or not will impact a lot of people in their workplace.
I'm sorry, but you seem like the type of person who knows the country isnt going to drastically make it harder to live for them. It's easy for people in that position to see work as...just work.
If that's not the case with you I apologize. But what happens with politics 100 percent impacts me at work and I should be able to talk about it.
What happens with politics impacts me at work too, but my response is not to spend time talking about it at work. My response at work is to make my work valuable to my employer. My response outside of work is none of my employer's business.
You left out a reason: that the workplace is for getting work done, not for arguing about politics.