Catherine,
Somewhere this must have gotten lost in translation. I never argued that noone should go solo. I argued that the OP should not go currently, which he agreed with and that maybe he should revisit this topic after doing about 100 dives or so with a buddy.
I'm sure he'll have bad and good buddy experiences, run into a few problems that need to be solved under water, even if minor and in general get more experience.
I then argued that having a good buddy is much better than having no buddy. I disagreed that diving in low viz is equal in it's risk to solo diving. I agreed with you that diving solo in bad viz would be even worse, IMO, base on what I experienced.
Personally I'm still on the fence on the whole bad buddy thing. I try not to dive with people that I believe are unsafe.
To touch on the motorcycle thing, noone will be able to help me if I screw something up while dragging a knee in a corner at 80 mph (yeah, I do that). Having someone else around really doesn't help. Now if I crash and am still alive after, having someone come back to haul my broken body out of the ditch _may_ help. From personal experience, if they're screaming it's good and being able to go for help immediately is also good. And by the way, I am quite certain that riding a sport bike the way that I and my friends do, places us at far great risk of death.
Same with airplanes I would think, hard to help your buddy if you are a commercial pilot.
Not so with diving IMO.