WHITE-TRASH
I wanna be Dave
Not at all true, or relevant. The US has lots of guns, but the majority don't carry. We're polite because we're civil and we have laws that we (usually) honor.
That quote comes from a fictional story where literally EVERYONE has a gun and they don't hesitate to use them against anyone that might personally upset them in the slightest. If you behave impolitely, chances are you're going to eat a bullet. That is what that quote means.
The quotes origin isn't the point. I'll use Switzerlandas an example again. The citizens are armed and trained. Most of the uninformed people in the world have little respect for them due to their appearance of weakness due to staying neutral in conflict. In reality they are some hardcore bad assessment that the true bad guys of the world know not to fawk with since they're armed and trained to defeat them.