Your argument on the... genetic predisposition of institutions in Russia even after a revolution, by the way, creates a very much self-defeating argument for the US. If self-interest creates terrible outcomes under capitalism in the US due to what it has "essentially always been", why would it not happen again under Syndicalism?
Under your logic of institutional stickyness, why would trade union leaders be fundamentally different from current business owners?
I break with a lot of socialists because I don't think the US is a horribly diseased society. I think that for a while, the US was pretty progressive, treating people well as long as they were considered human. White men in 1820s America enjoyed many more liberties than their contemporaries in Prussia. After the advent of white male enfranchisement, we began the slow and very painful extension of these rights to other groups. Slowly, political humanity was extended to marginalized groups. Obviously, it wasn't complete. African Americans have been legally equal since the '60s but endure horrible mistreatment at the hands of the state and private citizens. But given that our society is generally free, individuals can still demand change and actively affect their governance. Even despite the brutality of the Red Scares, socialist parties existed throughout the Cold War and are rising to slightly greater prominence.
We can assume that an socialist America would look a lot like a capitalist America, except for the obvious lack of private exploitation. Because American socialism would be designed by Americans, it wouldn't have much in common with the Sino-Soviet model. In the recent US, there isn't a tradition of summary executions or prison camps. We've never been a one-party state. I don't think suspending elections has ever been proposed.
Russia didn't enjoy this kind of reformist history. Conditions improved only when the state could not prevent them from improving, and the only period in which Russia could be considered remotely democratic were in the uncertain months after the Empire was abolished. Subjects of the Russian Empire were working with what they knew, and the size and ethnic diversity of Russia convinced many Soviet politicians that repression is inevitable.
Leon Trotsky wasn't any beacon of ethics, but he observed as early as the 1920s that the USSR was falling back on the old traditions of the Empire. Vladimir Lenin decided to remove control of industry from trade unions and instead give this power to the government, in which bureaucrats took the role of capitalists and aristocrats. Stalin's secret police behaved pretty identically to the Tsar's cossack attack dogs. Both sent political dissidents to languish in Siberia.
Your argument about trade unions is pretty common, but usually comes from the left. Communists further left than Trotsky often think that a "democratic company" is still dangerous because it is a company. While I see where these people (known as left-communists) are coming from, I don't think there's a more effective way of organizing industry. The lack of wage hierarchy and commercialism is important enough.