When I was young, I was always taught there were two topics that you never discussed in polite society -- or in the bar.
Politics and Religion.
The reason for that is both are mostly matters of belief.
@SalixIncendium, if there are more threads about US politics at the moment, this should hardly be a surprise -- the most talked about things all over the world right now are COVID-19 and American Politics. Thus, one should expect those topics to arise more often than they usually do.
And as the vaccine rolls out, and as a calmer and a bit more decorous government settles in in the United States, I suspect you will see a drop in the amount of time spent discussing them.