The probability in question was for if the live end of the cord fell
into the water. Roger's scenario had someone jumping into the water
after it, and then someone going in to rescue them. I can totally
agree that people who have no skills will often try to rescue someone
and die in the futile attempt. Happens a lot, especially in confined
space accidents.

It doesn't take much for someone to accidentally fall into the water. Be
they drunk, incompetent, tired, disoriented from a day on the waves or just
plain unlucky. There shouldn't be the added risk of FATALITY due to someone
leaving a LIVE cord lying about.

While I'm always a fan of the saying "Being stupid should hurt" it's not
supposed to be fatal. But I'll stop one step short of using the tired "what
about risks to CHILDREN!" shrill cry...

I don't think anything more than that is needed until such time as
someone talks to the marina and/or the boater.

This is true.