That said, I don't see this as a big deal. It's always been possible to mail weapons from a jurisdiction with easier access to them. Tor black markets just make it a little easier to organise.
Plenty of people don't like drugs, particularly banned narcotics and stimulants. I might even be uncomfortable in certain instances visiting someone who I know has drugs. Presumably if they have them, they use them on occasion. Let's ban drugs, right? Who cares whose privacy and property rights are violated as long as I feel better?
They also might accidentally stab you with a knife or have horrible aim when trying to butcher a chicken you're holding, and cut off your hand with a cleaver. Is it reasonable, then, to be uncomfortable around knives in a kitchen, too? Even when they're not in use? Within certain boundaries of storage and safe handling and usage, knives are not dangerous.
It's the same with guns. Within certain boundaries of safe handling, by someone who you don't suspect is mentally unhinged, gun possession or use is a non-problem. Anyone who is unsafe with guns, around anyone who's familiar with gun safety, will quickly be educated about proper gun handling.
As with bows and arrows, and swords, and crossbows (which, when cocked, are not so different from guns... they must be handled very carefully, but where's the casual disparagement of crossbow owners?). And all other things that have their places in everyday use, sport or culture, even when they could be dangerous. The origins of guns as weapons is irrelevant. Guns are not unique in that respect, yet many people who dislike, or are afraid of guns, treat a gun phobia uniquely as something to be praised. "How would any reasonable person not be afraid of guns? They're instruments of death!" How would any reasonable person not be afraid of a crossbow, or a katana, or even a knife? We learn to use knives safely without fear, and learn not to be afraid of swords and (cross)bows when they're being stored or carried or used properly.
In Britain it is! Bin that knife, criminal!
I don't understand why people can say, "oh he's a farmer, so he's not insane for having a gun" but the moment someone's not a farmer, they're suddenly unhinged or obsessed with violence, as opposed to perhaps, a target shooter or other kind of hobbyist. It's like they have this mental pattern "grandpa with a gun" where it's ok, and everything else just sets off alarm bells. It's odd, because it's usually liberals (in the US this is a liberal/conservative thing) that have more "openness to experience" but for some reason they are rarely open to the experience of growing up with guns, considering them dangerous but useful tools, using them for sport and hunting, and not being insane while doing so.
Weapons of war have historically become objects of sport: it happened with fencing and archery - firearms are no different.
I've never been able to fathom that argument. Even if a gun was made to kill people (one could equally argue that a particular gun is made for target practice or hunting and often that is true) the intentions of the maker of an object have absolutely nothing to do with whether you should be scared or not.
As an example, suppose someone hits you on the head with a hammer. As you sit in the hospital with a concussion is it any solace that the maker of the hammer intended it to be used on nails?
I grew up in Port Lincoln in South Australia. My father owned a couple of .22 rifles, I've fired shotguns a few times, currently live in Launceston in Tasmania, more than half the 30 odd guys I work with own one or more (mostly more) guns. None of them require a firearm for work purposes, they're all hunters / enthusiasts.
Most of the people I know are comfortable with guns. None of the gun owners I know are "odd/unhinged", and I think that is an uncharitable characterisation of gun owners in this country.
For many people firearms are amazing creations of metallurgy and machining, and hold artistic values in and of themselves, in the same way some people appreciate knives or swords, or cars or aeroplanes.
And most Americans would be uncomfortable going to a nude beach with their German friends. That says nothing about its morality or safety.