The Russian revolutionaries wanted something more than famine and injustice -- and that's much of what existed in Russia at that time. They wanted equality for all persons. That was a big goal of the communist agenda, and the Russian Revolution was a communist endeavor. They wanted to achieve that equality both in terms of wealth/property and in terms of political status and rights.
Was it dangerous? Absolutely. The reign of the tsars had gone on in Russia for centuries, and military victory over the tsar's armies had to be won for the revolution to succeed. And it was not going to be easy to make the nation better off, even after the revolution. The people would expect results from the new government. Those results were going to be hard to achieve.
Over time, the Union of Soviet Socialist Republics (USSR), which was the nation brought about by the Russian Revolution, has to become more and more authoritarian and repressive to keep its agenda going. And eventually that agenda failed, when about 75 years after the revolution, the USSR's government collapsed.
