I wouldn't say that in the past they have been as polarized. In fact you can actually measure this by looking at node connections.[0] But we need to hold politicians accountable. That's the mechanism to keep them in check but we're also failing at that.
[0] https://www.washingtonpost.com/news/wonk/wp/2015/04/23/a-stu...
So what is different now?
My pet theories for suspects are: social media algorithmically enhancing negative emotions and behaviors, a relative lack of enforcement of white-collar crime (especially amongst the rich), large media conglomorates (not a new phenomenon really, but the current ones are a bit different than past) and wealth inequality.
No one is claiming they were. This isn't a binary thing, it is a spectrum. So what's different now? Where they lie on that spectrum.
> My pet theories for suspects are:
You and pretty much everyone else. This is extremely common. But these are also pretty common things in history. Though again, spectrum. We're in one of the most unequal times in America. Rich rarely got persecuted, ever (hell, remember the Pinkertons?). Rumors and misinformation used to spread faster than horses could travel. So let's instead look at what similarities there are to historical examples.