I think it's worse recently because of the world stage: the Trump victory has opened floodgates and given voice to emotional responses once absent - or if not absent, then not as polarized - from everyday life. I think Brexit has done exactly the same thing: no halfway house can exist.
Maybe it's because the stakes are higher/being raised?
Irreversible Climate Change tipping points,
Mass migration due to failed regimes and climate change,
The proliferation of (Nuclear) Weapons,
Unstable/Oppressive regimes,
Change of World leadership towards China,
Increased (eye-witness) visibility of wrongdoings by use of Mobile Phones,
etc.
The Powers that were, have a lot to lose and they are losing it.
Cheers,
Bart