This is most certainly not what I or anyone else means by root cause. Guns are just instruments. This is like blaming hammers for building houses. The root cause is that which causes someone to use a gun they have or get a gun they don't have. Having the right to have one is not that cause.
> This has nothing to do with poverty.
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.
> The main problem here is that people have access to and an obsession with deadly weapons. This obsession leads them to acquire those weapons even when they have no legitimate reason to own/carry them. Accidents are bound to happen even with trained users, but typically the risk is worthwhile when you have a legitimate need to own/carry the weapon. When you don't have a legitimate need however, it's just needless risk-taking that will eventually produce situations like this.
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).