Essentially there was a range of opinions that used to be "acceptable" or "publishable", and that range expanded with the rise of social media, and then "split". So people who fall in one window don't want anythign to do with the others
For example, you have polarised media outlets (usually funded heavily by non-advertising - donations or subscriptions). You have polarised people. Everyone assumes you belong to one or the other window.
If I strongly identified with one of the windows, I wouldn't want to write for or appear on an organisation that falls in the other window. If my paper identifies with one window, I wouldn't want to get writers from the other.
All this has happened. All this has given us heavily polarised politics (in India, UK, US, etc.). What is also happening, and what I consider more dangerous, is that ideas are also being put in these "two overton windows" and people are distancing themselves from them
For example, a long time back on some WhatsApp group (don't remember which one), I had made what I thought was a watertight argument. And the only rebuttal I got was "but that's the argument that Bhakts make".

Another time on another group, "that's the Brexiteers' logic"
These were in a way ad hominem attacks - ideas being dismissed solely because the "other Overton Window", which these guys wanted nothing to do with, shared these ideas.

When ideas and logic gets coloured with politics, things can get really tricky
Like yesterday I did this tweetstorm. https://twitter.com/karthiks/status/1250362089585033216

It's all maths. Maths, as far I know, doesn't have a political leaning.

Except maybe I was a bit careless in one of the tweets which made me a favourite of "one overton window"
That also meant that the other overton window had to try and take it down.

Now if you have energy, look at the replies to that tweetstorm. It's completely gone cuckoo.

I give up.
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