>>as opposed to the way the Affordable Health Care Act attempts to pervert the process by documenting that mere ownership of a gun is a possible indicator of a mental health issue

Actually Title X page 2,037 re "Protection of Second Amendment Gun Rights" has the opposite effect to what you describe.

>>But that gets back to the problem that many (not all) who are left of center in the U.S. don't want to talk about - the aspect of mental health. A common denominator in nearly all these mass shootings - the shooter is nuts

Obama again: “The United States does not have a monopoly on crazy people. It's not the only country that has psychosis... and yet we kill each other in these mass shootings at rates that are exponentially higher than anyplace else. Well, what's the difference? The difference is, is that these guys can stack up a bunch of ammunition in their houses. And that's sort of par for the course.”

FWIW, in 2013 CDC calculated that gun violence annually costs $5.6 billion in medical bills and ? $100 billion in lost productivity from gun morbidity and mortality.