Russia was experiencing democratic protests against their czar and might have had a peaceful transition to democracy in 1918. German-supported propaganda ended up ruining their 20th century. Russia is copying that playbook.
The Germans definitely sent Lenin because he would pressure whichever government Russia ended up with to withdraw from the war. It's wrong to call Lenin a German agent the same way it's disingenuous to call Corbyn a Russian agent in the UK just because he's a critic of NATO.
Anyway, it's a fallacy to think that Russia would be fine without the Revolution. Peaceful transitions to liberal democracy are an exception that only happen on very particular cases.
I think you have it opposite. Aren't there far more examples of peaceful transitions to liberal democracies (ie, almost every country who had a monarchy in Europe and or were under control of said countries... and now has a parliament/republic).
Albeit it took longer and it was "gradual" but few of them had the hyper-violent post "vanguard" revolutions events that resulted in some of the worst tragedies in history?
https://en.wikipedia.org/wiki/Great_Purge (note famous french liberal Jean-Paul Sartre attempted to cover up news of this event in the west because he thought it would hurt the spread the revolution to the global "politeriat")
Almost all violent revolutions have resulted in a stain on world history. Yet the (less news worthy) numbers who gradually adopted independent courts and shifted from monarchy to republican/parliamentary power are much higher, and none of them had awful mass murders of people whose ideas weren't "in line" with the revolutionary ideology, not long after the revolutions.
Anyway, it's a fallacy to think that Russia would be fine without the Revolution. Peaceful transitions to liberal democracy are an exception that only happen on very particular cases.