The period after the French Revolution that threw down monarchy and more or less brought democracy to Europe was called the Terror [1] as well and tens of thousands of people were guillotined or executed (that was quite a lot of people at the time). Unfortunately, when oppressed people overcome the power in place, bad things happen as the results of the change in the balance of powers. IMHO this is similar to what happened when Bolsheviks took over the tsars and Communist Chinese put down the Emperor. I am of course not condoning violence (I am French and still in shock with what just happened) but I think these examples are sometimes more a sign of the people getting rid of hundreds (thousands) years of oppression than a particular political alignment. Unfortunately history is rich of mass killings in the name of politics, religions and other ideologies.
[1] https://en.wikipedia.org/wiki/Reign_of_Terror