sounds like angry people on both sides but to take someones life over a mattress is a frightening indictment of the state of affairs in the USA. The problem is gun ownership and the "right" to bear arms is so enshrined in their culture the laws on gun ownership will never change. you can only hope that there is a change in attitudes towards the use and prevalence of firearms over the coming years but i very much doubt it. Other countries manage entirely fine with high levels of gun ownership and done seem to have anywhere near the level or extremeness of incidents the US have so its not about access to firearms but more about both the attitude of the people and the attitude towards the use of firearms. Regardless of blame there are now children without a father and 2 families potentially destroyed through one angry encounter
Imagine the traveller community with guns though, it's probably a similar thing to this. Localised between warring tribes.
The stats on gun deaths in the US are all skewed and overly sensationalised.