An Orion spy stabs Kirk in an act of violence
Violence was the act of causing destruction, pain, or suffering.
Outside the sickbay, Leonard McCoy and James T. Kirk talked about Miranda looking through Spock's mind and Kirk mentioned that even Spock felt the violence of her jealousy. (TOS: "Is There in Truth No Beauty?")
In 2365, Jean-Luc Picard attempted to enjoy a Dixon Hill holographic program in an attempt to escape from the attentions of Lwaxana Troi. The program, however, opened with an assailant immediately threatening Hill with a pistol, causing Picard to freeze the program and ask the computer to reconfigure it, that he wanted "more ambiance, less substance." When, however, the program restarted, Hill was faced with a sinister figure who made threats and then grabbed him by the lapels. Picard again froze the program, complaining that the computer had simply substituted one form of violence for another. He again asked for a reconfiguration, only for Hill to then be faced with a man now brandishing a Thompson submachine gun. (TNG: "Manhunt")
Tuvok noted in 2372 that he had studied violence for over a hundred years, and found it disturbing. (VOY: "Meld")
Following the murder of Frank Darwin, Lon Suder mind melded with Tuvok, and in the new calm, Suder felt he could observe the violent tendencies inside of himself. Though Tuvok recommended releasing his violence impulses on the holodeck, Suder believed holographic violence did not produce the same sensation as the real thing. Suder also likened mind melds themselves to an act of violence. (VOY: "Meld")
When the USS Voyager ferried a group of Nygean prisoners, one of the guards, Yediq, justified beating Iko because of the dozens of violent crimes Iko had committed, and that violence was the only language he understood. (VOY: "Repentance")
In the 31st century, a Kyrian holoprogram titled "The Voyager Encounter" inaccurately characterized Captain Kathryn Janeway as having believed: "When diplomacy fails, there's only one alternative. Violence." (VOY: "Living Witness")