DB, Thanks for you reply to my P.M. and I understand where you're coming from. However, we've also lost crews in 100% VMC.
Having worked under "other" rules where the weather limits were written down as "at Captain's discretion", I've occasionally flown (not recently because I now fall under under more stringent rules), in extremely poor weather conditions. Sometimes an IFR recovery was out of the question and a hover taxy in very poor visibility was the only option, other than ditching the whole show in the sea. "Captain's discretion" means exactly that, obviously if you get it wrong you might pay the ultimate price. The crew involved in this instance had a better option, they could have landed on the ground, so presumably were happy enough to carry on with sufficient visual cues.
Is JSP 318 still valid, btw?