Here's a recent interview with him
He addresses violent speech from both the President and throughout the public cacophony and proposes some approaches that can reduce it.
Cure Violence, his organization's website
And Contagion of Violence: Workshop Summary from the
Forum on Global Violence Prevention from the Board on Global Health; Institute of Medicine; National Research Council
Just like poverty, hunger, COVID19, climate, racism, and too many other problems to mention, we know a lot about what to do and even have the tools to do what needs to be done.
We just don't do it.