Suicides, accidents, necessity for the police to carry guns everywhere and use them liberally, mass shootings and their cultural impact. 'Everything goes' approach to policing because 'they risk they lives everyday'.

There's a lot of factors to consider to evaluate how dumb idea it is exactly. And what you get in exchange for all that additional risk and harm is just extension of childish or at the latest teenage power fantasy way into the adulthood where it does not belong.

You shouldn't trust cherry-picked statistics no more than you trust politicians you don't agree with.

You should just look at what the civilized world outside of USA is doing and with what results.

You acknowledged the statistic is a correlation earlier. There are also many other correlations with lower gun homicides in the US. The causation is the interesting fact, and harder to determine. The argument that increasing gun sales causes lower gun homicides fails some logic and common sense tests, and would need evidence before anyone takes it seriously. Until then, it is seems more likely that other factors that we do have evidence for (eg. lower lead exposure leading to a drop in violent crime across the board) is causing the lowering of gun homicide in the US, despite the fact that gun sales are increasing.