Diver Dennis:I think most solo divers that I know dive in tropical locations, good vis, warm water. To me, this is a lot more benign environment than poor vis cold water. While it is true that many things could go wrong, diving with a bad buddy can make things worse as well. Personally, I think the drive to the dive site is more dangerous than solo diving. I should preface this, I'm talking about experienced divers who do more than the average 10 dives a year.
I tend not to agree with you, I have done lots of 0 viz diving, which for all intensive purposes is solo diving. This is how I got starting in solo. I will admit most of my solo diving in tropical waters, but that is because I was living in the tropics (Hawaii) until I moved back east diving isn't so great in Maryland.