I think the real division on the “left” can be boiled down to those using all the language and rhetoric of left wing ideology but in service of fascist and conservative ideas.

For example, tankies or people who have been brainwashed by tankies; a person can spend all day talkibg about how they support Palestine and BLM and LGBT rights etc. but then turn around and defend the CCP, which completely undermines any claim that they’re actually on the left/center.

So in that way it’s less of a “progressives never agree” and more of a “anti-progressive ideas are constantly pushed into progressive spaces to undermine them.”

Don’t take this as Stalin defending, but if you are trying to accomplish movements to the Left and both Person A and Person B want Worker Ownership of the Means of Production, and Person C wants literal fascism, is Person B being a Stalin defender worth creating a 3 way battle when people who identify with C far outnumber A and B combined currently? That seems to go against what is strategically necessary in the US, at least.

I think it’s more important to build a cohesive worker movement that’s as large as possible before we move on to discussing Marxism vs Anarchism vs some other flavor of Leftism, at least in the US.