It's a good thing if more and more people are moving to the left, especially those who might 10 or 20 years ago voted for centrist Democrats. In that way, I welcome polarization, but I think we need a clearly defined polarization that takes into account class division, and seeks common ground on some of the culture war issues, or at least seeks to put those issues secondary, as we try to go back to a 99% vs 1% division. To me that's the number one priority.
Historian Andrew Hartman visits the new Trump front of American culture wars of the 1980s and 90s (and 60s and 70s) - as longstanding divisions around class and identity remap themselves onto a new cultural and economic landscape in the decade after the 2008 financial crash, and increasing polarization presents both a challenge and an opportunity for the left.
Andrew wrote the article The Culture Wars are Dead: Long live the culture wars! for The Baffler.