Earlier quoted context omitted.
I think I agree with what you said about American conservatism; it's an interesting idea at least. But what's an example of a political issue that would affect someone's work at Basecamp? So you do a lot more than just cut out “distracting” conversations this way. You uninvited certain people entirely, and in doing so have taken a hell of a stance on that persons inherent worth. I can't think of many political topics…
It wasn’t that long ago that even in tech, you couldn’t mention same-sex spouses without backlash. And that’s still the case today in other industries (particularly ones that don’t have a sizable internet culture influence like tech does). So like to apply that specifically to a work context: that’s saying “no watercooler chat about what you and your spouses got up to over the weekend” because your spouse existing is…
Without these "oh politics is sin" things, the bosses saying no might require them to justify it. Instead they can now weasel their way out of this kind of stuff, and basically shield themselves from criticism on this front, even if people internally might want to change [0]
Lots of conservative ideology is around this, trying to turn some subjective defense of beliefs into like... some objective rules about not doing X/Y/Z (basically maintaining the status quo). I'm not saying the decision makers are conservative, but that's what the result is going to be here.
(tbh I think there are good reasons to minimize discussions about current events into places where people aren't forced to be exposed to them at work. I know I don't want to, just cuz I'm already exposed to it a lot. But there's a difference between banning politics talk and just asking people to keep it in certain areas IMO)
[0] https://basecamp.com/about/team they don't have the engineering/non-engineering split here, but 50-odd people and they have 3 Dans + 3 Jasons. There are definitely companies with more absurd balances and the people at Basecamp probably would like to see improvements! But this kinda stuff makes it harder.