I think the “lesser of two evils” phenomenon plays a role on the left just as does in the broader arena. We grow so accustomed to a horrible establishment that we begin to overlook the myriad faults of leftists in their rise to prominence, only to be forced to contend with said faults after they have the ability to create fractures by way of influencing their large followings against what is sensible and ethical.
A good example is someone like Julian Assange. Even if we give him the benefit of the doubt about everything other people have said about him, his own Twitter feed, which comprises his own words, is so loaded to the brim with racist and misogynist statements, that you can hardly pin a thinking person’s perception of his odiousness on psyops or propaganda — he is unequivocally hoist by his own petard. But, the establishment is so incredibly terrible, and Wikileaks has participated in discernible and undeniable ways in undermining the establishment, that Assange continues to get a pass from much of the left, while the rest of us simply can’t stand the guy. Both Wikileaks and the left would be better without him at this point, but it appears that he isn’t going anywhere.
I think, given the nature of iniquity, that it is a valid position to rip into leftists who fall short on one or more metrics. While they frequently are the lesser of two evils vis-à-vis the establishment or far right, they will ultimately be divisive and prove largely unhelpful if not corrected or put in check, and will unwittingly (if we’re being generous) end up creating new avenues for both distraction and marginalization.
The bottom line with the left is it is harder to unite when you actually have scruples and your goal isn’t just to blow up everyone who isn’t in your tribe. The fight for justice isn’t easy, but all you have to do to perpetrate injustice is be a dick. This asymmetry is largely why the very psyops you mentioned tend to only go in one direction, and why the fight for justice is still an uphill battle even after 10,000 years have passed since the dawn of civilization.