...on purpose, just to cause a reaction. You missed that bit.
When i'm driving vehicles i have to qualms waiting for elderly or disabled people to cross the street, regardless of whether or not the crosswalk has a light.
Dipshits intentionally walking slow just to piss me off deserve to piss off someone who gets out of the car and demonstrates their discontent in a more direct manner.
If you want to label dislike for lack of civility as being a psychopath so you can feel better about yourself be my guest.