"Progressives should not make the same mistake that Ernst Thälmann made in 1932. The leader of the German Communist Party, Thälmann saw mainstream liberals as his enemies, and so the center and left never joined forces against the Nazis. Thälmann famously said that ‘some Nazi trees must not be allowed to overshadow a forest’ of social democrats, whom he sneeringly called ‘social fascists.’
After Adolf Hitler gained power in 1933, Thälmann was arrested. He was shot on Hitler’s orders in Buchenwald concentration camp in 1944."
Just a note, while ranked voting is much better, the people who are influenced by parties that game the system and a gullible ignorant base usually consolidate themselves into one big party that still does everything to undermine the rest of the coalitions as long as it makes them look bad even if it’s worse off for society as a whole and that like a tumor can keep growing until it goes past the midpoint for toppling the democracy that elected it. It’s part of the solution, but not all of it, societies act like headless chickens when things get bad enough, regardless of who was responsible for them. For example, Brexit.
2nd note, RCV is better, but approval and star voting are best.