+10; thanks for that story. As much as I post advocating a mirror, I’ve never suggested that rationale. I have on occasion imagined the satisfaction, if someone was buzzing me, to avoid their pass and perhaps they would crash as I suddenly stopped; like the skateboard scene in Back to the Future.

I think that the malicious/psychotic fraction of motorists is really small, and likely correlates with location and/time of day. But under the circumstances described, I’m sure a rearview mirror affords an element of surprise unsuspected by an assailant. Otherwise we are pretty vulnerable.

FWIW, my door zone rule is, "Like a gun, assume every stopped car (parked or at a traffic stop) is loaded, with an occupant ready to open the door." A rearview mirror promotes taking the lane.

I used the mirrycle until it broke off my shifter. Looking at that arm mirror. For now I have a bar end mirror on my drop bars.

First commute with it and I LOVE IT! What was I thinking???? I put it on my drops (bar end) and would glance down to watch any movement behind me. Great stuff!