There is some truth to this but it overlooks the fact that the Bolsheviks were distinct from other socialist parties from the very beginning by their top-down, authoritarian party structure, with Lenin in control. As soon as they gained power, they immediately worked to impose this type of management on the entirety of Russian society by crushing first the Duma, then the Soviets, and finally eliminating any autonomy exercised by their own supporters, the labor unions. They also immediately began engaging in electoral chicanery and postponing or rigging elections in their favor. By destroying or subsuming every other institution in society, the party structure became the primary structure of governance, and Russia became a totalitarian state. Most of this took place even before the civil war and was arguably a major contributor to it.

So why did Russia become a dictatorship? Because the Bolsheviks decided it was desirable based on their understanding and development of socialist theory, and other forces failed to stop them for various reasons. It’s pretty much that simple. The civil war and foreign pressures probably strengthened this tendency but I don’t believe it was the primary cause.

And of course, almost every other socialist revolution since that time was inspired by the Bolsheviks since they “succeeded”. So they largely sought to impose dictatorships as well.

Ultimately it all goes back to Marx and his idea of the dictatorship of the proletariat which is one of the crucial flaws of Marxism in my view.