In blade in the dark, you declare how much gear you plan to bring, so the GM knows whether it’s normal guys with a backpack , or guys in tactical suit with bullet proof jacket and a rifle.

But in general, yes, the setting need to react to adventurer party. It’s not ordinary

I think open carry of weapons is common in most D&D settings.
It’s the unfettered, solipsistic violence that’s the core issue, not as much which instruments the used for such. 😅🤓