It’s pretty simple. Most MLs critically support ML states. Almost all of them, for example, hate that Stalin banned homosexuality. At the same time, they can also appreciate how both Mao and the USSR doubled life expectancy and ended famine. By metrics, both states improved rapidly.
As an Anarchist, you can learn a lot from MLs on how to actually get stuff done. Anarchism is a beautiful dream currently, outside of fringe cases like Revolutionary Catalonia it hasn’t actually existed to a meaningful extent. I’m not saying you should become an ML, but MLs typically take their routes because it gets results, even if the Means aren’t pretty at all.