FWIW I agree with you and recognize that to be one of the reasons it frequently isn’t allowed.
I also think there’s very few places with the power to meaningfully dialog with and among people who build stuff in Silicon Valley. I have dozens of friends, coworkers, etc who are in FAANG or the newer big tech companies, and all of them are extremely well paid, and most will insist they work for positive reasons. I believe in that most of them believe in other people, and don’t want to build a surveillance society or one that concentrates all wealth and power in a few.
For this reason, I think that some conversations on here are important to have - the impact technology is having on people who are outside the tech sphere, the effect of leaders of our companies on the economy, geopolitics, and power generally. Mark Facebook is a powerful player on the world stage. So is Paul Graham, and Sundar Pichai. Davos just took place - leaders from major economies are seeking guidance from these people who many people here work for. Let nobody say they aren’t participating in politics. Where you work matters, what you build matters. It’s not tinkering around in people’s garages anymore - they’re building the infinity gauntlet and someone is gathering all the gems. The Death Star plans are on AWS.
To pretend otherwise is to deny one’s responsibility - in the short term frequently profitable. In the long term, the pendulum tends to swing back..
If your problem is that you have no means to control what other people find important enough to talk about on a public forum, in their spare time, or that the means at your disposal to do so are insufficient to make other people saying things that make you uncomfortable go away... That isn't a problem that can or should should be fixed. Hell, the desire you've expressed could be uncharitably interpreted being contributory to part of the problem that has people around you discussing politics in the first place.
What if I'm concerned that leaving such topics up would attract more of the kind of people that prefer discussing these topics over tech topics?
Hiding doesn't fix the problem.