Doc Intrepid once bubbled...
99% of all divers who dive alone will survive nicely.
99.99999999999993%, more like it.
Doc Intrepid once bubbled... If the low probability event happens while they are solo, their survival is doubtful.
Those are the odds that solo divers accept. So long as they are willing to play those odds, so be it.
Your post is very true, but you must also factor in dependence on a buddy that may not be able to do the job, and a buddy that might outright kill you when he encounters his own problem. However high or low you may consider those two percentages to be, they will offset, to an individual degree for each diver, the safety disadvantage of diving solo.
As the poll is going now, less than 10% of the divers taking it practice adequate buddy protocol.
Now they've made their choice, fine.
But what if they're your buddy?