In my current company, political discussion is forbidden, and I am very happy about that.
People who love politics should go into politics, and leave their jobs. Plenty of public sector organizations who only talk politics for them, and peace of mind for me at a company.
"If you love talking about professional sports you should leave your job and play professional sports." See how genius that sounds? People can be interested in- or passionate about things and not do it as a day job.
You can advocate for a politics-free workplace. Or a distractions-free workplace. But you have to realize that from its early days Google was supposed to be less a job and more a lifestyle. Partly because it attracted talent, mostly because it would keep people in the office slinging code. You can't push developers to spend 14 hours a day in the cube (or beanbag chair or whatever) and also expect them to remain hermetically sealed from the outside world.
It ain't so black-and-white, and people with this kind of mentality are what enable the atrocities we've seen in the past and are seeing today.