So there may be valid arguments in here, but you're using a bunch of flawed logic in the way you've presented them here:
> I note that any incident that involves a gun is assumed to be caused by the gun, as though no unarmed person ever were assaulted or committed suicide. That tells me everything I need to know about how conscientious the research is.
Yes, they're looking at correlation rather than causation, but looking at real world data that's usually your only option. Dismissing the research on as not 'conscientious' on that basis seems a little weak, perhaps you'd care to support it some?
> If these researchers cared about public health they would have helped us end the damned drug war a decade ago. As if.
This is entirely fallacious... the world doesn't conform to your "if X really cared about Y they would have done Z" narrative. By that same argument no president, no congress, and nobody who approves of the war on drugs, cares about human life.
Edit:
If you prefer not to talk about suicide; how about self-defence... in 2014 (according to FBI data) there were 229 cases (total) where a criminal was justifiably killed by a civilian [1]. To put that in perspective there were 281 mass shootings in 2014... 1,759 people were killed by firearms during arguments [2]... and 1,601 injured in gun-related accidents.
Similarly this study [3] found that carrying a gun increased your chance of being shot by a factor of 4.5.
The whole "armed citizens don't need police" thing may actually be fair... but you're much more likely to need an ambulance.
[1] https://www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2014/...
[2] https://www.fbi.gov/about-us/cjis/ucr/crime-in-the-u.s/2014/...
[3] http://ajph.aphapublications.org/doi/abs/10.2105/AJPH.2008.1...