“Those who make peaceful revolution impossible will make violent revolution inevitable.”

I've heard it differently. "Those who make peaceful revolution impossible, will make violent revolution inevitable."

Here's a YouTube of JFK saying it as above:
https://www.youtube.com/watch?v=ugH-mxFzr9U

When taken in the extreme ("impossible"), the concept as a whole is most accurate. When the peaceful efforts / revolution are met with an "improbable" (Gandhi by example), the result is different.

What a topsy-turvy world in which rioting and mayhem is "peaceful" while gathering peacefully at the nation's capital for a redress of grievances is an "insurrection."

There must be a differentiating course between violence and revolution. Every upset individual on a mass murder spee probably justifies their action as some kind of revolution.  This reasoning leads me to declare a revolution can only be peaceful.