I've stopped drivers a few times for having their lights out at night (and been stopped once). In my case I just felt embarrassed, but I figured they had a good reason to be walking out on the road in front of me and flagging me down. Didn't occur to me to be angry. The woman I stopped looked kind of annoyed I was bothering her, didn't even say thanks. The guy I stopped was too scare of the coof to roll his window down more than an inch, but at least he said thanks.