> The root cause is that which causes someone to use a gun they have or get a gun they don't have.
My argument is that the US has an unhealthy culture around guns that prompts people to acquire/carry them to make a point as opposed to a legitimate need of them for self-defense/etc. This in turn leads to more weapons being out there than necessary and more opportunities for someone to be stupid with them. I don't believe this particular shooter was involved in any kind of legitimate use of a gun during this shooting, and I doubt they had a good, rational reason to have one on them at the time. Rather, they were bored, stupid or under the influence, a gun was within reach and they decided to play with it.
> You've provided zero evidence or argument for that yet sociologists over deacdes have accumulated masses of evidence that poverty does cause gun violence and countries have responded to this in real life by reducing poverty which in turn actually reduces gun violence.
I definitely believe poverty causes intentional shootings. But so far I don't believe this was an intentional shooting (even if the original target was different); this sounds more like idiots negligently discharging a gun many times without thinking about the consequences but there was never an intention to kill or harm, so I'm not sure the usual statistics (which are mainly due to gun-related crime which can definitely correlate with poverty) would apply here.
> This is just a litany of assertions with no evidence or argument behind them which happens to contradict all research on the topic and effective policy (in most of Europe).
Potentially, and you are indeed welcome to disagree. This is just my personal opinion based on noticing an obsession with guns that I haven't seen in other countries that allow guns.