Politics have consequences. When elected politicians vote to arms ongoing genocide, people die. When elected politicians vote to deny people healthcare, people die. Politics and its consequences is inherently violent. 
. If you want nonviolence take up rattan basket weaving
Remind them that not having free healthcare is an act of violence.
Remind them that not having a home to live in is an act of violence.
Remind them that sacrificing one minority group to appease a political opponent is an act of violence.
Remind them that being able to be fired from a job for any reason or no reason is an act of violence.
Remind them that having a paycheck that can’t pay rent, groceries, utilities and medicine is an act of violence.
Eviction is violence.
Arresting or shooting trespassers is violence.
Stealing people’s food and water is violence.
Destroying people’s food and water is violence.
All of these things are directly attached to thinks liberals would never change.
All of this is true, but I can already hear the lib reaction. 3/4ths of it will be hand waived away as “not violence” because the direct action doesn’t cause any direct physical harm in their eyes. The remaining 1/4 they might sheepishly admit is violence but “it’s just how things are”
US workers rights are mediaeval. Unionise and battle the elite for the best of everyone like the sivil world did a century ago. Get with the program of human dignity.