I shank them with a rusty scrap of metal to the neck
One of these is obviously worse. Yes, both are violence. Yet to simply try and paint them as such would show you're either not arguing in good faith, or, as respectfully as possible, your brain hasn't fully developed.
But let's mix it up. I slap someone. But I, a man that's 6'2" and does physical labor, slapped an infant for crying. Seems a little worse than it did at first, huh?
I am being attacked by a random person who is trying to murder me, and in a panic, I grab something, and attack him with it. Turns out it was a rusty piece of metal. Now we have hints of self defense.
Once again, still violence, but both were to different degrees, and the context changed both of them.