Arguing "I'm an anarchist" and following it with "anarchism doesn't need class analysis" is harmful to anarchism in particular, and to the left in general. Would you also see no problems with a self-declared leftist saying "trans rights are irrelevant"?

Words mean things, if you don't fit the definition for a political ideology or movement then you're not in/a member of it in any meaningful way, also there's a long and extremely well documented history of US intelligence agencies infilitrating leftists groups so gatekeeping is actually just 100% necessary and anyone who says otherwise is either a moron or a fed

My point being that actual CIA propaganda was a godsend to MLs. They can use the existence of it to deny anything bad about their movement

The most nuanced discussion I've seen of communist crimes is in ML circles. Deportations of ethnic Koreans and Crimean Tatars in the USSR, excess repression during the eve of WW2, freedom of speech and discussion in the late USSR... All of that receives extensive detail discussion in ML works such as Albert Szymanski's "Human Rights in The Soviet Union" and "Is The Red Flag Flying", long discussion in "People's Republic of Walmart" with an entire chapter devoted to repressions in the USSR, and an in-depth analysis in Robert C. Allen's "Farm to Factory" and Alec Nove's "An Economic History of the USSR". I'll update you when I read Domenico Losurdo's book on Stalin.

The fact that we don't uncritically swallow anti-communist propaganda fiction works such as The Gulag Archipelago, and refuse "historians" who worked with guesswork before the opening of the Soviet archives doesn't mean we deny atrocities. The point is that despite big mistakes in the construction of REAL socialist states, they've still been the most emancipatory and anti-imperialist projects on the face of the earth, and have brought untold good on the people who lived under them