>>2759410people's politics is mostly determined by their disposition, not by matters of theory or policy as such. you're just looking at a clash of personalities wrapped up in socialist language.
if you could get them all to take the big5 test, you'd notice statistically significant differences between vegans and anti-vegans, pro and anti-porn types, consumerists and anti-consumerists, and (this one has actually been done academically) liberals and conservatives. once you see this, you cannot unsee it.
communists are perhaps particularly prone to such infighting because communism can draw in a number of distinct personality types: some who're "super-liberals" (very high openness, agreeableness, neuroticism), some who're more conservative and in it for the military aesthetics of socialist governments (lower openness, agreeableness, neuroticism is a coin-toss), others who're contrarians, or who've come to it specifically because they
hate liberals (and, so, little do they know, hate some communists even more.)