Depends on what kind of mass violence you’re thinking of.
The degree to which you can control its extent, direction, and collateral damage is the degree to which you can justify it.
An organized millitary march to capture vital infrastructure and establish defensible positions in preparation for retaliation and most likely war, quite easily justified.
An unhinged hate fueled massacre and mass raping to the point of literally smashing open panic room vaults to drag out more victims to murder and rape, well at least Lemmygrad and Hexbear will still have your back!