Earlier quoted context omitted.
After living in the US as a European for 1.5 years, I've come to the conclusion that americans tend to be more afraid in general. For example I've never heard in Europe of recommendations like 'when selling stuff through craigslist always meet at a starbucks but never at home' either. Also being smart and/or nerdy actually is valued in Europe. It may also be a Southern thing though.
At least for your craigslist example, the fear is not unfounded. [0] That one example happened just last month in my town. The weapon in that case need not be a gun, a knife or baseball bat wielding friend hiding in the bushes would work well too. Perhaps better than Starbucks would be the police department parking lot. That is actually a preferred place for private gun sales - if the buyer is uneasy about conducting…
The reason why you don't have to be afraid when dealing with Craigslist in europe is that guns are rare, as is gun violence.
But I'm sure some will just buy another gun to feel safer. Isn't that the standard argument after a serial shooting? The first victim should have had a gun, then this wouldn't have happened... that's as perverse as it gets!