I'd be really curious to see an "aging report" for firearms that are used/involved in mass-shooting incidents -- I roughly know the answer for the most recent and most newsworthy (read: horrific) incidents. I'd just like to see more data on the topic, specifically 'time from manufacture to use as a murder weapon', to better understand exactly how much potential impact there is.
I'm aware private sales exist, and the implication that mentally ill people may turn to private sales, but I'd be curious to see the data on this nonetheless.
I'd similarly be curious to see a breakdown/data on "source" of weapons used in incidents like this (and even on attempted/homicides, domestic cases, etc), as well as an aging report -- to better understand how much "impact potential" legislation actually has.
While I do support legislation, I'd also like to better understand how impactful it could be and how quickly we might see an impact; I'm also aware of semi-mixed efficacy from (some) prior legislation (state & federal), though I'm personally still in favor of additional legislation, even if only because my 'gut' says it would be a net positive impact.
Or at least until we can predict mental breakdows and crimes of passion.
We need to attack this problem from all angles. That includes both gun safety laws and media safety laws. The mentally ill should not be regularly be reminded of the idea that attacking schoolchildren is something they can do.
If we really want to solve this problem, strict and comprehensive media safety laws will need to be part of the solution.
If guns are illegal it's far easier to rid the country of them instead of a complex mesh of laws that vary by state, county, city, township. Fewer guns certainly makes accidents, impulsive suicide and manslaughter much less likely.
More incidents = more mandate = more budget.