A lot of people have a purist attitude to politics. "Critical support" is a vital part in understanding these positions of Hexbear and others, that one can support a side of a conflict and still be critical of it. Geo-politics isn't a simple binary. No two groups will perfectly align, but that doesn't mean they can't see mutual lines of benefit despite their disagreement. For example, just because someone supports Ukraine doesn't mean they have to defend everything their government does, such as supporting the neo-Nazi Azov Battalion. It would be absurd to assert that! Similarly, it would be absurd to tell the communists still crying about 1989 that they support the entirety of the capitalist Russian Federation, the same RF that destroyed many of the gains the USSR made for both countries by enabling oligarchs to loot the place and plummet life expectancy.