Man of Honour
Yes. Because why else are you carrying the gun? Answer me that.
[..]
You don't. But I'm betting there's a much higher proportion of law-abiding bus drivers that manage to get on with their day without killing someone than people who decide to go out carrying weapons. The difference is that a bus is designed to be used as a method of transportation, a gun is designed to kill people. I can use my keyboard to slap some sense into you, but that's not what it's designed for and hence if I walk onto a train carrying a keyboard nobody is going to bat an eyelid.
Guns are designed to kill people, that's literally their only purpose. Excuse joe public for assuming that's what you're carrying it for. [..]
I think you're over-egging your argument.
In cultures where carrying a weapon is normal, it does not follow that the only reason to be carrying a weapon is to kill people. Do you, for example, assume that all Sikhs are constantly killing people? An observant Sikh will be carrying a weapon, an object designed to kill people.
There are millions of people carrying weapons in the USA. If your argument was correct, hardly anyone would be left alive in the USA, which would be a fragmented mess of petty warlords and their fiefdoms.