why were the russian peasants angry?

Answer 1

They lived under a feudal system while other parts of the world were being democratized and Czar Nicholas had absolute power and lived in economic decadance whilst they were poor and powerless.

Answer 2

They were unhappy with the czar, who although abolishing serfdom, was still lagging behind in economic reforms and most of the peasants were still living the same life of poverty and misery.