I haven't seen this addressed in the discussions about curbing gun violence, but it seems highly plausible that gun incidents may be correlated with the ups and downs of the economy.
I'm no statistician, but I wonder what a plot of shootings vs., say, the unemployment rate would look like. And of course you'd want to include suicides, too.
I'd expect the Right would try to suppress any discussion of this, since if a connection were found, it would be one more reason for the government to help the victims of the bad economy, and to do something to address unemployment.