I do agree with your examples here even if perhaps not other examples you had in mind. Not every group of allies which worked with or under the Assassins are necessarily good people who share their principles. This is true to reality because many activist groups are united by common causes but have their own substantial differences in other areas that can rupture their cohesion later. We see this again and again throughout history.
Personally, I hate the idea of ever working with petty criminals, crime syndicates, pirates, the Triad/Mafia/Yakuza, etc., which the Assassins (and the Templars) has a tendency to do in the lore. I think there are probably pragmatic arguments about why the Assassins would do this. If the Templars are already controlling the gangs, the argument might be that the Assassins have no choice but to contest them there. But I still find the idea very unsavory, and their corruption by Jack the Ripper is a great example of why this isn't tenable in the long term.
I also think the Assassins' support of the Bolsheviks in the Russian Revolution is in very poor taste. In actual history, there were many factions of socialists in the late 19th to early 20th century—some of whom rightfully opposed the idea of a "dictatorship of the proletariat"—but the Bolsheviks were literally the most extreme ones. They were terrorists who continued to rule through state terrorism upon gaining power. It makes me think that some at Ubisoft writers were a bit too attracted to Marxism...
I only have one correction to make because I'm a bit confused what you meant in regards to the French Revolution. The Assassins had allies across the political spectrum including constitutional monarchists, Girondists, and the Jacobin George Danton. Their main concern in the revolution seemed to be just preventing the excesses of it, which is why they tried to save people from across the spectrum and opposed the Reign of Terror. But you're right that at the end of the day, they seemed to have made a controversial truce with Napoleon Bonaparte, even saving him when he was about to be assassinated by royalists. It's really curious what the full story about this was since they did support the Haitian Revolution at the same time and Arno was evidently disappointed in Napoleon at the time of Dead Kings.