I think it's safe to assume that those instincts habe been dialed in long before the current state of relative danger fell into place. Fear of wiry bipeds that

I think it's safe to assume that those instincts habe been dialed in long before the current state of relative danger fell into place. Fear of wiry bipeds that aren't actually that big but might carry sparkling stuff would be a far more specific, younger and thus variable fear. But then on the other hand train speed is dangerously difficult to assess even for us humans who in theory know full well what a train is. I believe that this is because much of the perception of movement is in terms of "size-units over time", which is why a fly at walking speed appears fast whereas big ship at 25 knots appears almost stationary unless you are too close for your own good.