I put it down to the fact that modern media-driven, first-past-the-post, limited-party democracies don't trumpet compromise.
Compromise happens often, but nobody wants to talk about it, because it's not primary-sexy.
So people are left with a news/PR feed that only shows the political extremes.
E.g. In the US, how many of the near-unanimous votes did you hear about?
* Senate: https://www.senate.gov/legislative/LIS/roll_call_lists/vote_...
* House: https://clerk.house.gov/Votes