re: "cagers little bubble of invincibility"

I agree they are usually quite surprised to be confronted by an individual. They are used to everyone staying in their car and swearing; hand gestures and horn blowing. It is quite rare indeed that a cager gets out of their vehicle to confront another cager - and when that happens - it's usually violent. so when an individual approaches their car - you get their attention right quick! no need to rant rave and break stuff, your mere pressure shakes them up a bit.