Some months ago, I posed the following question, partially repeated here:
our family and friends want to celebrate on a hot summer’s eve with the ability to cook outside and lounge around with cool drinks. About 20 of you head to a park but you all reject the areas with picnic tables and the like. Instead, you park in an area a bit distant from the river – because there is a ditch in the way built by the city (interestingly, only earlier that day) exactly to prevent vehicles from going to the riverbank. You then all lug your stuff to the riverbank through some foliage.
There, parents allow their children to play in the river in the visibly-moving current, despite the fact that not only can none of the children swim, but also none of the adults can. Unlike city parks with pools, there are no lifeguards, although a few other individuals are nearby. These non-swimmers bring a total of one life preserver, not worn by anybody but tossed out on the bank. And thus tragedy occurs when six youths drown.