According to the model proposed in the book Violence by James Gilligan, violence is driven by (better: has the necessary precondition) shame. I wonder if this allows to derive new, possibly effective interventions, roughly in the direction of "provide humans prone to perpetrating violence nonviolent means to resolve their shame". Some brainstorming: Therapy would be the obvious route, but also seems costly. Maybe just a call-line for acute emotional support (and heavily advertising it) would do the job, avoiding the worst. Maybe shame also prevents people to reach out or even acknowledge the emotion in the first place, such that someone has to come to them to ease the shame in some way. Not sure, but I'd love to see more people looking into this direction.

Also, from the model I'd a priori expect that more shame would make the situation worse, so I'm somewhat skeptical of interventions like "serialised drama radio programs", as they might just displace the problem into other areas (e.g., suicide).