I'm returning to the moderator's original question: what were the ultimate causes of the Russian Revolution? And simply for the sake of provocation (because I love a good discussion), I am going to lay the blame entirely on Peter the Great. Well, let's think about it. His legacy was a very mixed, very problematic one. Some, like myself, might even call it disastrous.
I'll enumerate what I view as Peter's chief areas of liability. First, by forcing the Russian upperclasses to adopt Western ways he caused an enormous cultural schism between the Russian nobility and the Russian peasantry, which was fully in evidence in the revolutions of 1905 and 1917, and accounts for much of the violence in the countryside. As far as I can see, from what I've read, this schism was unnecessary - it was the result of forced change at an unnaturally fast pace - Peter wanted Russia to become Western overnight. In fact Russia was already becoming gradually Westernized, long before Peter's reign, and this process, with a less impatient ruler at the helm, could have continued naturally, at its own pace, for the next hundred years or so, with much less (or even no) trauma to the national identity as a result.
Second "crime." Peter decided that Russia had to be a world power. Every Russian ruler since him has followed his (bad) example. Instead of concentrating on fixing the problems endemic to ruling a vast empire (communication, administration, and let's not forget serfdom), Russia's monarchs turned their attention - and most of their resources - to staking a claim as a major European political player. With great success, but only at an equally or even greater cost. First and foremost because serfdom wasn't abolished until the mid-nineteenth century. (But even the administrative problem was never solved while the tsars were still in charge.) And by the way, I'm borrowing this thesis, in toto, from Aleksandr Solzhenitsyn's history book about Russia.
Third "crime." Peter the Great left the succession undecided. He did not clearly outline his wishes as to who should succeed him after his death. This resulted in literally decades of misrule and confusion as the Russian empire fell into the hands of one incompetent and underqualified (and frequently foreign) ruler after another. This was a lost period in Russian history. Lost to history, also lost to progress.
In short, I blame most of tsarist Russia's endemic problems, which arguably came to full fruition in March and October 1917, on Peter the Great. In the immortal words of Aleksandr Solzhenitsyn, "Peter the Great was Russia's first Bolshevik."