Ah the club debate :)
Some folk like clubs, some don't. Live and let live.
Join a good club and you'll get a lot out of it, if it's what you like.
For sure if matey boy joined a club, and went along on a few meets and learnt a bit off other members then he might have known to watch out for false floors.
But then again he could have gone off with a bunch of non-club mates, learnt from them (as a lot of us did) and known what to watch out for.
Or he could have read up - online or in books - on the dangers.
And in any of those ways he could, probably, have avoided falling down an 'ole...
Or of course he could have joined a club, nodded intently when people told him about false floors, how they can look solid, and to be especially careful in water, and headed off solo and fallen through one.
Ditto he could have come along on a trip with this or any other web site, or just with a group of mates, ignored everything said, then gone off solo and gone for a plunge.
Or he could have extensively explored (for example) slate mines or caves (this is not an anti-cave or caver comment, not my style, it's merely an observation that some dangers are inherent to the specific underground environment) where this isn't necessarily a danger and headed off into a metal mine and become a statistic.
But simply being in a club doesn't mean this accident wouldn't have happened...
And not being in a club doesn't make anybody a statistic waiting to happen.
All that said, it's entirely possible he might read this, so hopefully nobody will end up finger pointing.
I don't think any of us is beyond having an accident. At the point I start thinking I am I hope one of my exploring mates (club members or otherwise) will give me a kicking and tell me to stop being a liability.
my orders are to sit here and watch the world go by