If you have a differing point of view on post-capitalist society as someone, yet agree with them in their critique of capitalism, then you should work on getting rid of capitalism before you divide yourself, because in the present, you are allies. Non-violence is something that everyone should strive for in their every day lives. It s one of the main reasons many people refrain from consuming animals and animal products, as well as goods from corporations with exploitive labour and environmental practices. The goal should be to eliminate the source of the majority of violence in our world by fighting against it. A violent institution has never been overthrown because people politely asked them to step down, and expected them to follow their pacifist example.
Institutional violence needs to be fought against.