This may differ by locale, but this is (or, can be) an extension of motorcycles being relatively rare. In my normal driving, I see about 3 a week and usually not even having to negotiate the road with them. They're just passing by or present in some other lane doing some other thing that requires little action from me. From that perspective, it's unusual/rare that I find myself negotiating a lane change around a motorcycle or turning in front of. Again, further expand that to when I do find myself in a situation where it's dark and I'm turning and I see a light - it's usually my 3rd/4th/5th thought of "what is that?" before I realize it; even when completely undistracted. I usually act defensively and pause to give my brain a moment to catch up rather than pulling out in front of something I haven't recognized yet but this level of attention and behavior is very easy to lapse even by the best intentioned drivers. It's not a great approach to expect everyone else to be a perfect driver at all times.
There are differences in awareness between drivers though. When I drive a car, I (quite literally) ask myself whether there's a motorcyclist around at every junction or right turn (in a LH drive country) I come to. My conditions are pretty unusual - I'm primarily a motorcyclist and rarely drive (to the point where I find myself nodding involuntarily at riders even when I'm driving). I'm not sanguine about raising people's average level of awareness - of motoryclists, or anything else! So I agree you wouldn't choose it as a road safety strategy. I'd still keep antenna up for anything that might amplify awareness though.
