I actually had a parent give me the, "If it saves just one child..." argument.
I used to play hockey, I've heard that line so many times it drives me insane.
I even got a lecture about being a good example when somone brought there family to a game, and his mother saw me stripping padding out of my helmet and several of my teamates (they asked me to, it makes the helmet fit better).
Considering the fact that we were all over 21, I thought she was a wee bit of a nut.