I’m here thinking: “but gunshots are not a disease? Wait, gunshots ARE treated at hospitals, and probably take a lot more resources to treat than, say, a fever. So it does fall within his purview in my uninformed opinion.”
And then I thought “But why are people shooting each other? Maybe he should have declared a mental health crisis?”
So to conclude, I think it would be more productive to treat the mental health issue, and gun crimes should reduce. Of course, reducing the number and availability of guns would help too, but seems a harder problem to tackle.