One does, actually, by the definition of ‘left-wing’ politics, exclude the other.

Horseshoe theory and other ‘enlightened centrist’ viewpoints were created solely, and I do mean solely, to disrupt class consciousness. Nearly all propaganda you believe that make the USSR or China seem bad was created by the US wholesale, with some being created by criminals given extremely cushy paychecks for life for utilizing their background to give legitimacy to stories made up by people that never left the US.

‘Intolerance,’ doesn’t enter into it. Period. There isn’t any documented accounts of that from any left wing government. Period.