Rod, perhaps you would enjoy reading the research of the National Academies of Science (NAS). I've also provide some research from the CDC which seem to fly in the face of your assertion that gun violence research is "banned". It somehow escaped the "Federal Ban" to which you refer. (I wonder when the Trump Administration is going to round up the Johns Hopkins Center for Gun Policy and Research who are openly conducting "banned research".)
But if your assertion was correct, why did the Obama administration and the Democrat controlled super majority in congress ban it as well?
If in fact the "ban" to which you refer is the "Dickey Amendment" of your New Republic article; it actually does not ban research but the requires the CDC not become an advocacy or lobbying group. It was signed into law by (gasp!) Bill Clinton...
You see the lobbying activities of federal agencies are governed by the Anti-Lobbying Act (18 USC Section 1913, originally enacted in 1919). The purpose of the Act is to prevent agencies, acting through their employees or SGEs, from using appropriated funds, or resources secured with appropriated funds, to lobby any federal, state, or local government official with respect to any pending or proposed legislation, resolution, appropriation, or measure.
But I digress... for your reading pleasure here's some (according to you) "banned" research on the subject from the CDC.
Priorities for Research to Reduce the Threat of Firearm-Related Violence | The National Academies Press
http://dhss.delaware.gov/dhss/dms/files/cdcgunviolencereport10315.pdf
Firearm-Related Violence
As for "why does it matter" in response to my observation that you were never in the military, given some of your postings, I'm not sure you could get your hear around the answer.
Sadly, it looks to me that the paddock has become political theater more than anything else so perhaps it really doesn't matter. While the hysteria continues, at least the name calling has somewhat subsided since Randy and Keith's intervention.