Odd by comparison to the smaller magpies, currawongs, blue-faced honeyeaters & noisy miners that can so readily shoo them off. They're pretty shy with people too, which isn't true of many common urban birds. Though that shyness may have quite separate origins (humans being what they are and all that).
I wonder if it's a behavioural strategy somehow related to their carrion-scavenging niche.
Not sure what is odd about risk-aversion. How many times have you been injured?