Well, you weren't specific about where or when- how would someone know?
Good point.
Thinking about it, you can consider the English civil war, French Revolution, Russian Revolution, US Revolution (war of independence)... violence and enormous bloodletting seem par for the course - where the social / societal revolution in the USA in the early 20th century was relatively peaceful (relatively!).
Sadly I don't get a "bloodless" vibe about things today - if things swing in that direction, it could get very nasty very quickly.