Concerning the "issue" of "Leftist Infighting"

There is no such thing as "leftist infighting," and the argument for that is not "If you do infighting, you're not a real leftist," but rather that the struggle between various tendencies within the "left" spectrum is constituted by non-antagonistic contradictions. They are contradictions among the people that are to be resolved, and through the resolution of those non-antagonistic contradictions, movement is made possible. You can't have any progress without the resolution, and thereby, as a presupposition, the existence of non-antagonistic contradictions.

If, however, we struggle against liberals or left- or right-opportunists, we are not struggling against fellow leftists. We are struggling against, as the name implies, opportunists, who for their own benefit intentionally corrupt the revolutionary essence or otherwise deprive communism of its revolutionary essence. That is not leftist infighting. To oppose opportunism is not to oppose other leftist tendencies but rather to oppose liberal and other right-wing tendencies that are cloaking themselves as leftist.

If I conduct discourse with left-wing anarchists, I am not, per se, conducting infighting. It can turn into infighting if that discourse is turned into a set of ad hominems or is based on false premises and prejudices. Discourse per se with anarchists is not necessarily "leftist infighting," but is an expression of contradictions among people. As those are contradictions among people which are non-antagonistic in character, they are to be resolved properly and peacefully. This leads to progress in theory and practise, and as such it cannot be considered to be "infighting." Infighting is much more prevalent among the right wing, actually, for instance among right-wing libertarians and classical liberals. This is an expression of infighting.

This is something the West needs to take into consideration uniquely, as the leftist movement in the West mostly consists of ultra-left deviations such as anarchism, Trotskyism, left communism, and other ultra-left tendencies. We cannot exclude those tendencies within the revolutionary movement because they constitute a majority in the West. If we want a serious revolutionary movement, we cannot just brush those revolutionary or potentially revolutionary tendencies away, but instead we have to resolve the non-antagonistic contradictions among those tendencies.