I find reading the early revolutionary sources for the French, American and Russian revolutions that they're really not asking for anything we modern folk would consider too wild, since they were basically reacting against monarchy, aristocracy or a proto-capitalism run largely by the aristocaracy.
Comparing Russia against America with its long, if flawed, history of Socialist (yes really) and Republican (as in anti-monarchy) Democracy seems to make much less sense when the revolutionaries that apparently should have known what Marxism or "The Terror" would lead to were asking for that same basic stuff as the American ones.
I mean the basic point of this python joke (other than punning on 'class') hinges on "all men are created equal"
https://en.m.wikipedia.org/wiki/All_men_are_created_equal
And the famous Animal Farm seems to take a similar view:
https://www.cliffsnotes.com/literature/a/animal-farm/critica...
The Jacobins got executed and replaced by the Thermidorian Reaction, which was a shift "rightward" and may have paved the way for Napoleon. And France generally also had to fight wars against the combined monarchies of Europe (which they generally did and won) which again, paved the way for Napoleon to become emperor.
I'm still at the early stages of reading up on Russia, but the Bolsheviks at the time are "radical" but aren't really calling for more than what we'd view as actual democracy. By "sensible reforms" I assume you mean people who advocate mostly just leaving concentrated wealth concentrated, and then obviously you've got wars and outside empires there too as well as the remains of the concentrated wealth.
I dunno, it feels like there's centuries of cultural and political propaganda that gets in the way of objective views on this.
The Bolsheviks publicly called for whatever was popular at the time and what they thought would allow them to get into power. In 1918 they basically copied the entire Socialist Revolutionary programme (ending the war and distributing all land to the peasants without compensation to previous landowners and giving controls of the factories to their workers) and promised to end the war which basically guaranteed that most soldiers and ordinary people would not oppose them (they never had mass public support prior to the October revolution, at best a plurality in Major cities and approximately 0% in the countryside). However after they ousted the socialist government they proceeded with a policy of collectivization and centralization instead.
"aren't really calling for more than what we'd view as actual democracy"
No, the Bolsheviks lost the first democratic elections in Russian history, decided they don't like the results and dispersed Russian Constituent Assembly 13 hours after it convened. Unlike most other socialists in Russia at the time Bolsheviks were totally anti democratic from the outset, which is why they were so effective at gaining and holding power. While other socialist or liberal parties were organizing peaceful public protests, strikes or walkouts expecting that the masses would rally around them the bolsheviks simply sent in their troops.