Danny,
Agreed. Except for the BSA Military Model and the various German 1930s trainers that looked a lot like contemporary service rifles (and the many, many, air pistols that look a bit like a Luger, Frommer, 1911, or whatever).
My wider point, though, is that for the population at large, a gun is a gun is a gun. And guns are scary. Even a 1950s Diana 50M is a "scary gun", not, obviously, an un-scary air rifle.