If the con was going to have any position on this, it should be "No lifeguard on duty."
Agreed.
Just because something is not inherently safe does not mean it needs to be illegal or banned by policy. A warning for persons unfamiliar with the width, depth, and current of the Columbia, followed by"Use/do/go at your own risk; we certainly do not encourage this" is sufficient. Let free people make their own adult choices.
None of the Oregon Trail pioneers needed their society's permission to just walk away from excess nannyism, government baby-sitters, regulations, taxes, etc, but certainly they traveled at their own risk; no bridges or guard rails included.
Obviously, many made the trip.
It's your own risk and responsibility - but it sure doesn't hurt to remind people that many who didn't take this seriously were found eventually, miles down the river, with a new name.**
(**As in: 'Bob,' 'Sandy,' or even 'Sandy Duncan' [dunkin'.]
Old joke I heard in [our] County Search & Rescue and yes we *did* have to go out looking for dock jumpers and tweakers who just walked off into the river...)