That is not the case when talking of Reconstruction, see
The Memphis Riots of 1866 and, well, the whole Civil War that led to reconstruction in the first place.
And while we could characterize the Civil Rights Movement as "non violent", it was anything but. In fact, it used violence as a means of shaming. All of the major figures in the CRM knew that they were liable to get beaten, maimed, lynched, tortured, murdered...but that was the idea. Violence was still a vehicle to get what they want, they had just turned it around and used being a recipient of it as a means to shame white christians.
Martin Luther King Jr actually owned several guns in his own home until one of his advisors (and I believe it was Bayard Rustin, someone correct me if I'm wrong) told him that the optics of him having guns will not work with their strategy and he had to get rid of them. But no, read "This Non Violent Stuff'll get you killed
https://www.washingtonpost.com/news/volokh-conspiracy/wp/2014/07/28/this-nonviolent-stuffll-get-you-killed/?utm_term=.a27c90e85063
Violence was very much a central part of the CRM.