The speaker is responding to someone who claims that violence never solves anything. The line "violence never does nothing" is worded awkwardly, and the double negative technically means the opposite of what the other person intends. That slip may be accidental, or it may quietly hint that violence does do something, because the speaker has just felt its effect.
The turn comes in the last four lines. The person who preaches against violence is hurting the speaker with their own words, which "tear me apart / just like / violence does." The speaker is pointing out a contradiction: you can reject physical force and still wound someone deeply.
The mood is raw and bitter, but also controlled. The poem is short, with plain language and little punctuation, so the pain comes through without any shouting. The break before "just like" slows the ending and makes the comparison land hard. The speaker feels hurt, and also unheard, because the other person doesn't see the damage their words cause.