In general, as I’ve posted above, Pinker is predictably short-sighted.
Regarding the trend rates of violence—he fails to discuss what is happening on a recent time scale, and in particular locations.
I am also guessing that person on person violence would decrease because governments frown on it and put folks in jail, unless, of course, they are a protected class.
And, there may have been a subgroup of individuals that were involved in the brunt of the violence. Those folks would be in jail and more restricted in their choices for killing others in current times.
That said, I believe there is a spike in violence currently - at least it seems so - in the youngest generation and often against strangers. And I think it wouldn’t take much for chaos and violence to reign if the economy implodes, government notwithstanding.