This seems a little sophistic. Yes, incarceration is not actually violent. It may be "violent" in some metaphorical sense, and some of the other inmates may be violent, but incarceration itself is not violent.
I've had clients get incarcerated, and I've had clients facing potential capital sentences, and there is a world of difference.
I've had clients get incarcerated, and I've had clients facing potential capital sentences, and there is a world of difference.