Darren Addy
EF5
As to the original question (why did they look scarier), there is a starkness to a high contrast black & white image (as compared to a color image) but I think the biggest difference between then/now is the film speeds (ISOs) and thus the shutter speeds necessary (particularly for the REALLY old-time ones).
Just as a long shutter speed on a waterfall will cause the water to blend (rather than FREEZE), the slower shutter speeds necessary in days-gone-by result in tornadoes and debris that are blurred during the exposure (not frozen by it). This implies a motion (to our eyes) that freezing an image does not. More than any single factor, I think THAT is what makes them "scarier". This not just blur. It is motion-blur.
My two cents.
Darren Addy
Kearney, NE
Just as a long shutter speed on a waterfall will cause the water to blend (rather than FREEZE), the slower shutter speeds necessary in days-gone-by result in tornadoes and debris that are blurred during the exposure (not frozen by it). This implies a motion (to our eyes) that freezing an image does not. More than any single factor, I think THAT is what makes them "scarier". This not just blur. It is motion-blur.
My two cents.
Darren Addy
Kearney, NE