As you can see we all have differing opinions. The bottomline is that every story I have ever read where an accident has happened it is because broke one of the cardinal rules. I am not saying that diving with or without a buddy is one of those rules, but you have to really know what you are doing out there and dress accordingly. Also knowing the area you are diving is paramount if you do go solo. Whether I am teaching a class or on a fun dive I always assume I am a solo diver. Regular diving is one way to reduce (not eliminate) your risk level to yourself and others, DAN has many stats to back that up. So many times I have watched divers jump in the water and ask their buddy(s), "so what are we going to do?" That is a form of solo diving just because a lack of planning ahead. Two things that every diver needs to remember, 1) plan your dive and dive your plan 2) leave your arrogance at home. Whether you have 4 dives or 4000 dives, every time out is different just enough to get you killed if you aren't careful.