Give me a break... We don't drive on bald tires and with seatbelts to mitigate risk. That we you bring a safe second stage doesn't mean diving is dangerous, it means that it is safer if you learn and follow rules that make it safe. If you decide Stop lights don't apply to you, you make driving (or bicycle riding or being a pedestrian) extremely dangerous.
I have had exactly 0 (zero) OOA situations in hundreds of dives. I still bring an octo on every dive and on certain dives I would bring a completely redundant air supply. Your typical recreational, NDL diving is extremely safe. Just like any sport, you can f*** around and find out. Compared with skiing or mountain biking it is probably SAFER and has a lower physical fitness barrier than most other sports.
Can you die? Certainly. A bad hiking guide can get you killed.
To the OP. If someone dies on dive, should you avoid the shop? Was it some overweight guy with COPD that rented gear and drown during a cardiac event? Did they leave a dive site with people still in the water? Was it a student that was overweighted, panicky and left unattended on the bottom during a class by the shop owner? Was it a regulator failure immediately after servicing?
Most people, on the advise of their lawyers are going to keep their mouth's shut in aftermath of a diving accident. Information out of context can create a legal nightmare.
If you have a bad vibe about a particular shop that has been associated with a diver's death. Follow your gut instinct. If you have been on a dive and saw the boat or crew do questionable/ unsafe practices, follow your gut. At the end of the day, YOU are responsible for your own safety.