IMO, the only valid reason to solo, if there is one (excluding sidemount and some other very specialised situations) is because you want to. If you understand and accept the additional risk you have the right to risk your neck anyway you choose. Many forms of diving involve more risk than others, that doesn't mean we don't do it. All else being equal deep is more dangerous than shallow, Cold more dangerous than warm and the list could go on and on.
With that said, I have no respect for agencies or magazines who put on the kind of solo advertising campagn that we saw right before the solo course was introduced. I have read the course standards and looked at some of the instructors teaching this course and they have no clue, they are irresponsible and should be put in their place. The whole premise of the course is BS. Niether my shop, staff or myselfe recognise this course, in any way, as valid training. They will contribute to injury.
We have local dive sites who will rent you a pony and let you solo if you have this card. Ok. I do every dive equiped with more redundancy, more training and more experience than anyone who would pay for this course. Yet these idiots recognize the solo card.
All divers should strive to be self sufficient enough to complete the planned dive alone should the need arise. In technical diving it is mandatory. This is an emergency you plan for and prepare to survive not one we should encourage divers to go out of their way to create. How can a 2 dive class with a stupid pony be considered adequate training. The course allows the use of doubles (manifolded or independant). The instructors I know teaching this have never dove such equipment. They are not prepared to teach valve manipulation or gas management with independant doubles. Hell they couldn't even help a student assemble their doubles.
I will not pull any of these jerks out of the water without payment in advance. All I have to say to them is...I'll be back for your equipment!
90% of the divers can't keep their fins out of the bottom and some agencies put their energies into a solo course. Well...If their not going to keep their fins out of the bottom perhaps it is better that they are alone.
Sorry about the rant, it's one of the things that gets mo going.