OK, I'll touch an aviation theme and more:
In the 60s it never crossed our mind that we were visiting the wild west. We would visit Omaha, and we even managed Los Angeles armed with no more than a pitiful handful of dollars (no credit cards then). It never crossed our mind that there were gunmen and women around.
We certainly knew that an American guard or policeman that gave you an order was to be obeyed but not that most others were armed too.
Now would innocent visiting aircrew be quite so blasé?
Now, if you decided to buy and live in the US (as permitted) would you consider getting a gun?