Rebelfighter
while I don't think your charitable work is relevant to this thread, please be assured that I think it's very commendable.
I have worked in public service for many years - very strict on child protection issues. I am of the firm belief that child protection issues have no relevance on the case at hand - this man had no direct responsibility for a child - from what you say, there were no kids about anyway - if underwear, shorts or speedos are not a threat on the beach it's only learned behaviour that rules that it's a threat in a parking lot.
My personal belief (tho I hasten to add, not expert or scientifically proven) is that encouraging young children to have hang ups fears or shame about the human body is a form of child abuse in itself. There is nothing to be feared by the human body in its semi-nakedness in this particular case. There was no behaviour to suggest this guy was a threat to anyone - an exhibitionist maybe or more likely someone who was in a rush and really didn't give a sh!t what you, I or the world's wife thought about him getting changed for work in a car park. I admire him for that.