You're going a little overboard here. Gulf Diving is doing what their insurance company has instructed them to do. Solo diving has shown a greater level of risk in diving than any of your other listed activities.
TwoBit
Agreed...
If the dive community does their part to keep the attorneys at bay (proper training, certs, & equipment) and the dive operators do their part to keep the lawyers away (policies, insurance, etc) then there is no reason for anyone to be sued. If there is no one to sue then the lawyers go away. That's how capitalism works. If there is little or no money to be made then the business either goes away or is pared down to scale.