Irrespective of who's right on that point, there is a cultural issue here. People who have not lived with/around fire arms, and who do not hunt, have essentially no reason to ever encounter a fire arm. It is, save for violent crime, just not relevant to their lives.
Expecting them to be informed about firearms kind of isn't reasonable is it? So even if the information is out there, they've had no cause, nor frame of reference for figuring out how guns work.
So, when an explainer like this pops up on how easy it is to put together a gun, it's worthwhile to point out that turning some sheets of metal into a gun is really freaking easy, and banning all guns (even if it were legal) would be from a practical standpoint really really hard.
> As has been noted elsewhere in these comments, we do not have a problem with rifle violence in the US. [...] Let's fucking talk about that.
Dude, I could not agree with you more. But despite that, having even the most basic explainer on firearms is still a good thing.
So, anyway, how do we stop handgun deaths, deliberate or accidental? :P